Premiere Pro keeps crashing: "serious error has occured that requires Premiere to shut down"

For the process ... before opening any project file, go to the menu system, Preferences/Cache files, and delete ALL cache files.

Then create a new project file. In the Window menu option, make sure import workspaces is not checked.

Then in MediaBrowser, navigate to the old project file and click the old file, then right-click/Import ... and import one sequence at at time, testing it to see if it works.

That's the best process in detail in how to try and get access to at least some of a corrupted project.

Neil

Delete the Media Cache and Media Cache files:
https://community.adobe.com/t5/premiere-pro/faq-how-to-clear-your-media-cache-in-30-seconds-in-premiere-pro-2020/m-p/11017257/thread-id/260446?page=1

Hi AllenSun24,

We're sorry to hear about this. Before importing the original project in a new project, did you uncheck the option for Import Workspace from Projects (under Window > Workspaces)? Also, have you tried checking any of the recent autosaves for that project to check if it's working properly?

Thanks,

Sumeet