Target the same element with multiple jQuery Selectors,whats wrong help me

Tell us what’s happening:

Your code so far

  $(document).ready(function() {
  $("#target1").addClass("btn btn-primary");

<!-- Only change code above this line. -->

<div class="container-fluid">
  <h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
    <div class="col-xs-6">
      <div class="well" id="left-well">
        <button class=" btn btn-default target" id="target1">#target1</button>
        <button class=" btn btn-default target" id="target2">#target2</button>
        <button class=" btn btn-default target" id="target3">#target3</button>
    <div class="col-xs-6">
      <div class="well" id="right-well">
        <button class="btn btn-default target" id="target4">#target4</button>
        <button class="btn btn-default target" id="target5">#target5</button>
        <button class="btn btn-default target" id="target6">#target6</button>

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36.

Link to the challenge:

The Note says the following:

You should only be targeting one element and adding only one class at a time.

In your last line, you have:

$("#target1").addClass("btn btn-primary");

You are adding two different classes to the button with id=“target1”. The first one is “btn” and the second one is “btn-primary”.