Project won't open

Backup everything then get back to us with more details

Try creating a new project and import the old one into it.

Also, please help us help you:
https://community.adobe.com/t5/premiere-pro/faq-what-information-should-i-provide-when-asking-a-question-on-this-forum/td-p/3929027?page=1

If you want help: post comp specs, Premiere version and build,
and what you have done so far to solve the issue.