Error on MarkDown Preview

Hello please I’m doing the Markdown preview project and it keeps giving me this error " When I enter GitHub flavored markdown into the #editor element, the text is rendered as HTML in the #preview element as I type (Hint: You don’t need to parse Markdown yourself - you can import the Marked library for this: marked - Libraries - cdnjs - The #1 free and open source CDN built to make life easier for developers)". I’ve tried fixing it but i cant seem to find the error. Please any help will be appreciated. This is a link to my codepen

The codepen link you provided doesn’t go to your markdown previewer project.