Upgrading

I just tried to upgrade to the new version of WP…and I’m having some issues.

https://whole-shebang.com/blog/

Anyone know what I need to do to fix this error? Also, my log in page doesn’t look normal…and it won’t even let me log in with my information…says it’s an invalid username?

https://whole-shebang.com/blog/wp-login.php

Any help would be greatly appreciated.