Done, but with errors on page
The page also shows instances of old, invalid markup (uppercase instead of lowercase) and deprecated attributes/tags such as
font, 'align', 'center' etc.
If you're creating post/page content in an HTML editor and then pasting that into WordPress, stop. Your HTML editor is old and outdated. Create your content in WordPress itself.
If these errors are coming from your theme rather than your content, and you have created or customised the theme, you need to go back into your template files and correct your markup. If you haven't customised this theme and you don't have the technical skills to do so, then you need to change themes and/or look for some up-to-date plugins.