First: There are no Errors, only Warnings in the W3C-Validator for your site. You should check if you can remove them, but they don’t “break” your site.
The First Console Error wants you to fix the Google Font: The Font name to be used is “Assistant” not “assistant”. Don’t know if you can fix this yourself as you use a Premium Theme.
The second console Error is about the instagram integration. As i know nothing about this, i can not help you there.