after effects 2021 error crash in progress

Hi zain26632291jkqk,

Welcome to the community and sorry for the crash.

As Mylenium suggested, here's how you can reset the preferences: https://community.adobe.com/t5/after-effects-discussions/faq-how-to-reset-trash-preferences-in-after-effects/td-p/10634342

Is there a specific reason why you're using the 2021 version? If possible, try using the latest version.

The new version would be a separate install. If you remove the 2021 version, it won't be available to download.

Let us know.

Thanks,

Nishu

Start by deleting the preferences and also reinstall AE with sufficient user privileges.

Mylenium