You've got one too many of </div> in your sidebar. That's why the browser thinks footer-div is outside the wrapper-div.
Look for the code that generates
</div><!-- #primary .widget-area -->
and remove one </div> right before
The easiest would probably be to search your php files for
<!-- #primary .widget-area -->.
Secondly, you have an issue with a couple of links. It's your social media icons on the top (facebook, twitter, etc.). Should be
target=_blanc" (note " after the = and letter k instead of c). This won't affect the layout, but still something that you should fix.
You can safely ignore the rest of the errors.