Stuck at UserStory#10 in Technical Documentation Please help

Help Please. I’m stuck in Userstory#10. I need a pair of eyes to check my mistake.

There should be one .nav-link for every element with the class of “main-section”, and every .nav-link should be within #navbar : expected 13 to equal 12

Here’s my pen

Here’s my code:

 <nav id="navbar">
       <header>"Welcome to our new Product"</header>
      <ul>
       <li><a href="#Introduction" class="nav-link">Introduction</a></li>
       <li><a href="#History" class="nav-link">History</a></li>
       <li><a href="#How_did_it_Start?" class="nav-link">How did it Start?</a></li>
       <li><a href="#Project_and_It's_Science" class="nav-link">Project and It's Science</a></li>
       <li><a href="#Parts_and_Function" class="nav-link">Parts and Function</a></li>
       <li><a href="#Further_Installation" class="nav-link">Further Installation</a></li>
       <li><a href="#Sponsors" class="nav-link">Sponsors</a></li>
       <li><a href="#Timeline" class="nav-link">Timeline</a></li>
       <li><a href="#Progress" class="nav-link">Progress</a></li>
       <li><a href="#Technical_Problems" class="nav-link">Technical Problems</a></li>
       <li><a href="#Significance" class="nav-link">Significance</a></li>
       <li><a href="#Expectation" class="nav-link">Expectation</a></li>
       <li><a href="#What's_Coming?"class="nav-link">What's Coming?</a></li>
       </ul>
     </nav>
  </header>
  <main id="main-doc">
    <section id="Introduction" class="main-section">
      <header>Introduction</header>
      <p>Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.</p>
      <p>Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.</p>
      <p>Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis.</p>
      <p>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy</p>
    </section>
    <section id="History" class="main-section">
      <header>History</header>
      <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
      <p>Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</p>
      <p>Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.</p>
    </section>
    <section id="How_did_it_Start?" class="main-section">
      <header>How did it Start?</header>
        <p>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,  At accusam aliquyam diam diam dolore dolores duo eirmod eos erat, et nonumy sed tempor et et invidunt justo labore Stet clita ea et gubergren, kasd magna no rebum. sanctus sea sed takimata ut vero voluptua. est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat.</p>
        <p>Consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. </p>
      <p>Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos</p>
    </section>
    <section id="Project_and_It's_Science" class="main-section">
      <header>Project and It's Science</header>
      <p>She suspicion dejection saw instantly. Well deny may real one told yet saw hard dear. Bed chief house rapid right the. Set noisy one state tears which. No girl oh part must fact high my he. Simplicity in excellence melancholy as remarkably discovered. Own partiality motionless was old excellence she inquietude contrasted. Sister giving so wicket cousin of an he rather marked. Of on game part body rich. Adapted mr savings venture it or comfort affixed friends.</p>
      <p>Started earnest brother believe an exposed so. Me he believing daughters if forfeited at furniture. Age again and stuff downs spoke. Late hour new nay able fat each sell. Nor themselves age introduced frequently use unsatiable devonshire get. They why quit gay cold rose deal park. One same they four did ask busy. Reserved opinions fat him nay position. Breakfast as zealously incommode do agreeable furniture. One too nay led fanny allow plate.</p>
      <p>Imagine was you removal raising gravity. Unsatiable understood or expression dissimilar so sufficient. Its party every heard and event gay. Advice he indeed things adieus in number so uneasy. To many four fact in he fail. My hung it quit next do of. It fifteen charmed by private savings it mr. Favourable cultivated alteration entreaties yet met sympathize. Furniture forfeited sir objection put cordially continued sportsmen.</p> 
    </section>
    <section id="Parts_and_Function" class="main-section">
      <header>Parts and Function</header>
      <p>Full he none no side. <code>Uncommonly surrounded considered for him are its. It we is read good soon. My to considered delightful invitation announcing of no decisively boisterous.</code> Did add dashwoods deficient man concluded additions resources. Or landlord packages overcame distance smallest in recurred. Wrong maids or be asked no on enjoy. Household few sometimes out attending described. Lain just fact four of am meet high.</p> 
      <ul>
        <li>Nonsense</li>
          <p>Its sometimes her behaviour are contented. Do listening am eagerness oh objection collected. Together gay feelings continue juvenile had off one.</p>
            <code>Unknown may service subject her letters one bed. Child years noise ye in forty. Loud in this in both hold. My entrance me is disposal bachelor remember relation.</code>
        <li>Nonsense</li>
          <p>Over fact all son tell this any his. No insisted confined of weddings to returned to debating rendered. Keeps order fully so do party means young. Table nay him jokes quick. In felicity up to graceful mistaken horrible consider. Abode never think to at. So additions necessary concluded it happiness do on certainly propriety. On in green taken do offer witty of.</p>
            <code>Unknown may service subject her letters one bed. Child years noise ye in forty. Loud in this in both hold. My entrance me is disposal bachelor remember relation.</code>
        <li>Nonsense</li>
          <p>Boisterous he on understood attachment as entreaties ye devonshire. In mile an form snug were been sell. Hastened admitted joy nor absolute gay its. Extremely ham any his departure for contained curiosity defective. Way now instrument had eat diminution melancholy expression sentiments stimulated. One built fat you out manor books. Mrs interested now his affronting inquietude contrasted cultivated. Lasting showing expense greater on colonel no.</p> 
            <code>Unknown may service subject her letters one bed. Child years noise ye in forty. Loud in this in both hold. My entrance me is disposal bachelor remember relation.</code>
        <li>Nonsense</li>
          <p>By an outlived insisted procured improved am. Paid hill fine ten now love even leaf. Supplied feelings mr of dissuade recurred no it offering honoured. Am of of in collecting Devonshire favourable excellence. Her sixteen end ashamed cottage yet reached get hearing invited. Resources ourselves sweetness ye do no perfectly. Warmly warmth six one any wisdom. Family giving is pulled beauty chatty highly no. Blessing appetite domestic did mrs judgment rendered entirely. Highly indeed had garden not.</p>
            <code>Unknown may service subject her letters one bed. Child years noise ye in forty. Loud in this in both hold. My entrance me is disposal bachelor remember relation.</code>
        <li>Nonsense</li>
          <p>Is we miles ready he might going. Own books built put civil fully blind fanny. Projection appearance at of admiration no. As he totally cousins warrant besides ashamed do. Therefore by applauded acuteness supported affection it. Except had sex limits county enough the figure former add. Do sang my he next mr soon. It merely waited do unable.</p>
            <code>Unknown may service subject her letters one bed. Child years noise ye in forty. Loud in this in both hold. My entrance me is disposal bachelor remember relation.</code>
        <li>Nonsense</li>
          <p>Whole wound wrote at whose to style in. Figure ye innate former do so we. Shutters but sir yourself provided you required his. So neither related he am do believe. Nothing but you hundred had use regular. Fat sportsmen arranging preferred can. Busy paid like is oh. Dinner our ask talent her age hardly. Neglected collected an attention listening do abilities.</p> 
            <code>Unknown may service subject her letters one bed. Child years noise ye in forty. Loud in this in both hold. My entrance me is disposal bachelor remember relation.</code>
        <li>Nonsense</li>
          <p>Satisfied conveying an dependent contented he gentleman agreeable do be. Warrant private blushes removed an in equally totally if. Delivered dejection necessary objection do mr prevailed. Mr feeling do chiefly cordial in do. Water timed folly right aware if oh truth. Imprudence attachment him his for sympathize. Large above be to means. Dashwood do provided stronger is. But discretion frequently sir the she instrument unaffected admiration everything.</p> 
            <code>Unknown may service subject her letters one bed. Child years noise ye in forty. Loud in this in both hold. My entrance me is disposal bachelor remember relation.</code>
      </ul>
      <p>Letter wooded direct two men indeed income sister. Impression up admiration he by partiality is. Instantly immediate his saw one day perceived. Old blushes respect but offices hearted minutes effects. Written parties winding oh as in without on started. Residence gentleman yet preserved few convinced. Coming regret simple longer little am sister on. Do danger in to adieus ladies houses oh eldest. Gone pure late gay ham. They sigh were not find are rent.</p> 
    </section>
    <section id="Further_Installation" class="main-section">
      <header>Further Installation</header>
        <p>Up is opinion message manners correct hearing husband my. Disposing commanded dashwoods cordially depending at at. Its strangers who you certainty earnestly resources suffering she. Be an as cordially at resolving furniture preserved believing extremity. Easy mr pain felt in. Too northward affection additions nay. He no an nature ye talent houses wisdom vanity denied.</p>
        <p>Cottage out enabled was entered greatly prevent message. No procured unlocked an likewise. Dear but what she been over gay felt body. Six principles advantages and use entreaties decisively. Eat met has dwelling unpacked see whatever followed. Court in of leave again as am. Greater sixteen to forming colonel no on be. So an advice hardly barton. He be turned sudden engage manner spirit.</p>
        <p>Brother set had private his letters observe outward resolve. Shutters ye marriage to throwing we as. Effect in if agreed he wished wanted admire expect. Or shortly visitor is comfort placing to cheered do. Few hills tears are weeks saw. Partiality insensible celebrated is in. Am offended as wandered thoughts greatest an friendly. Evening covered in he exposed fertile to. Horses seeing at played plenty nature to expect we. Young say led stood hills own thing get.</p>
    </section>
    <section id="Sponsors" class="main-section">
      <header>Sponsors</header>
      <ol>
        <li>John Smith</li>
          <p>Feet evil to hold long he open knew an no. Apartments occasional boisterous as solicitude to introduced. Or fifteen covered we enjoyed demesne is in prepare. In stimulated my everything it literature. Greatly explain attempt perhaps in feeling he. House men taste bed not drawn joy. Through enquire however do equally herself at. Greatly way old may you present improve. Wishing the feeling village him musical.</p>
        <li>Jane Doe</li>
          <p>Woody equal ask saw sir weeks aware decay. Entrance prospect removing we packages strictly is no smallest he. For hopes may chief get hours day rooms. Oh no turned behind polite piqued enough at. Forbade few through inquiry blushes you. Cousin no itself eldest it in dinner latter missed no. Boisterous estimating interested collecting get conviction friendship say boy. Him mrs shy article smiling respect opinion excited. Welcomed humoured rejoiced peculiar to in an.</p>
        <li>James Park</li>
          <p>Affronting everything discretion men now own did. Still round match we to. Frankness pronounce daughters remainder extensive has but. Happiness cordially one determine concluded fat. Plenty season beyond by hardly giving of. Consulted or acuteness dejection an smallness if. Outward general passage another as it. Very his are come man walk one next. Delighted prevailed supported too not remainder perpetual who furnished. Nay affronting bed projection compliment instrument.</p>
    </section>
    <section id="Timeline" class="main-section">
      <header>Timeline</header>
      <ul>
        <li>1988</li>
          <p>Use securing confined his shutters. Delightful as he it acceptance an solicitude discretion reasonably. Carriage we husbands advanced an perceive greatest. Totally dearest expense on demesne ye he. Curiosity excellent commanded in me. Unpleasing impression themselves to at assistance acceptance my or. On consider laughter civility offended oh.</p> 
        <li>1990</li>
         <p>Use securing confined his shutters. Delightful as he it acceptance an solicitude discretion reasonably. Carriage we husbands advanced an perceive greatest. Totally dearest expense on demesne ye he. Curiosity excellent commanded in me. Unpleasing impression themselves to at assistance acceptance my or. On consider laughter civility offended oh.</p> 
        <li>1998</li>
         <p>Use securing confined his shutters. Delightful as he it acceptance an solicitude discretion reasonably. Carriage we husbands advanced an perceive greatest. Totally dearest expense on demesne ye he. Curiosity excellent commanded in me. Unpleasing impression themselves to at assistance acceptance my or. On consider laughter civility offended oh.</p> 
        <li>2008</li>
         <p>Use securing confined his shutters. Delightful as he it acceptance an solicitude discretion reasonably. Carriage we husbands advanced an perceive greatest. Totally dearest expense on demesne ye he. Curiosity excellent commanded in me. Unpleasing impression themselves to at assistance acceptance my or. On consider laughter civility offended oh.</p> 
        <li>2010</li>
         <p>Use securing confined his shutters. Delightful as he it acceptance an solicitude discretion reasonably. Carriage we husbands advanced an perceive greatest. Totally dearest expense on demesne ye he. Curiosity excellent commanded in me. Unpleasing impression themselves to at assistance acceptance my or. On consider laughter civility offended oh.</p> 
        <li>2020</li>
         <p>Use securing confined his shutters. Delightful as he it acceptance an solicitude discretion reasonably. Carriage we husbands advanced an perceive greatest. Totally dearest expense on demesne ye he. Curiosity excellent commanded in me. Unpleasing impression themselves to at assistance acceptance my or. On consider laughter civility offended oh.</p>
      </ul>
    </section>
    <section id="Progress" class="main-section">
      <header>Progress</header>
        <p>Arrived compass prepare an on as. Reasonable particular on my it in sympathize. Size now easy eat hand how. Unwilling he departure elsewhere dejection at. Heart large seems may purse means few blind. Exquisite newspaper attending on certainty oh suspicion of. He less do quit evil is. Add matter family active mutual put wishes happen.</p>
        <p>For norland produce age wishing. To figure on it spring season up. Her provision acuteness had excellent two why intention. As called mr needed praise at. Assistance imprudence yet sentiments unpleasant expression met surrounded not. Be at talked ye though secure nearer.</p>
        <p>Is branched in my up strictly remember. Songs but chief has ham widow downs. Genius or so up vanity cannot. Large do tried going about water defer by. Silent son man she wished mother. Distrusts allowance do knowledge eagerness assurance additions to</p> 
        <p>Civility vicinity graceful is it at. Improve up at to on mention perhaps raising. Way building not get formerly her peculiar. Up uncommonly prosperous sentiments simplicity acceptance to so. Reasonable appearance companions oh by remarkably me invitation understood. Pursuit elderly ask perhaps all.</p>
    </section>
    <section id="Technical_Problems" class="main-section">
      <header>Technical Problems</header>
      <p>Can curiosity may end shameless explained. True high on said mr on come. An do mr design at little myself wholly entire though. Attended of on stronger or mr pleasure. Rich four like real yet west get. Felicity in dwelling to drawings. His pleasure new steepest for reserved formerly disposed jennings</p>
      <p>As it so contrasted oh estimating instrument. Size like body some one had. Are conduct viewing boy minutes warrant expense. Tolerably behaviour may admitting daughters offending her ask own. Praise effect wishes change way and any wanted. Lively use looked latter regard had. Do he it part more last in. Merits ye if mr narrow points. Melancholy particular devonshire alteration it favourable appearance up.</p> 
      <p>Open know age use whom him than lady was. On lasted uneasy exeter my itself effect spirit. At design he vanity at cousin longer looked ye. Design praise me father an favour. As greatly replied it windows of an minuter behaved passage. Diminution expression reasonable it we he projection acceptance in devonshire. Perpetual it described at he applauded</p> 
    </section>
    <section id="Significance" classs="main-section">
      <header>Significance</header>
      <p>Can curiosity may end shameless explained. True high on said mr on come. An do mr design at little myself wholly entire though. Attended of on stronger or mr pleasure. Rich four like real yet west get. Felicity in dwelling to drawings. His pleasure new steepest for reserved formerly disposed jennings</p>
      <p>As it so contrasted oh estimating instrument. Size like body some one had. Are conduct viewing boy minutes warrant expense. Tolerably behaviour may admitting daughters offending her ask own. Praise effect wishes change way and any wanted. Lively use looked latter regard had. Do he it part more last in. Merits ye if mr narrow points. Melancholy particular devonshire alteration it favourable appearance up.</p> 
      <p>Open know age use whom him than lady was. On lasted uneasy exeter my itself effect spirit. At design he vanity at cousin longer looked ye. Design praise me father an favour. As greatly replied it windows of an minuter behaved passage. Diminution expression reasonable it we he projection acceptance in devonshire. Perpetual it described at he applauded</p> 
     </section>
    <section id="Expectation" class="main-section">
      <header>Expectation</header>
      <p>Can curiosity may end shameless explained. True high on said mr on come. An do mr design at little myself wholly entire though. Attended of on stronger or mr pleasure. Rich four like real yet west get. Felicity in dwelling to drawings. His pleasure new steepest for reserved formerly disposed jennings</p> 
      <p>As it so contrasted oh estimating instrument. Size like body some one had. Are conduct viewing boy minutes warrant expense. Tolerably behaviour may admitting daughters offending her ask own. Praise effect wishes change way and any wanted. Lively use looked latter regard had. Do he it part more last in. Merits ye if mr narrow points. Melancholy particular devonshire alteration it favourable appearance up.</p> 
      <p>Open know age use whom him than lady was. On lasted uneasy exeter my itself effect spirit. At design he vanity at cousin longer looked ye. Design praise me father an favour. As greatly replied it windows of an minuter behaved passage. Diminution expression reasonable it we he projection acceptance in devonshire. Perpetual it described at he applauded</p> 
    </section>
    <section id="What's_Coming?" class="main-section">
      <header>What's Coming?</header>
      <p>Can curiosity may end shameless explained. True high on said mr on come. An do mr design at little myself wholly entire though. Attended of on stronger or mr pleasure. Rich four like real yet west get. Felicity in dwelling to drawings. His pleasure new steepest for reserved formerly disposed jennings</p> 
      <p>As it so contrasted oh estimating instrument. Size like body some one had. Are conduct viewing boy minutes warrant expense. Tolerably behaviour may admitting daughters offending her ask own. Praise effect wishes change way and any wanted. Lively use looked latter regard had. Do he it part more last in. Merits ye if mr narrow points. Melancholy particular devonshire alteration it favourable appearance up.</p>
      <p>Open know age use whom him than lady was. On lasted uneasy exeter my itself effect spirit. At design he vanity at cousin longer looked ye. Design praise me father an favour. As greatly replied it windows of an minuter behaved passage. Diminution expression reasonable it we he projection acceptance in devonshire. Perpetual it described at he applauded</p> 
    </section>
  </main>
<section id="Significance" classs="main-section">

Fix the classs to class.

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