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Have you tried:

– deactivating all plugins to see if this resolves the problem? If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the default theme to rule out any theme-specific problems?

– resetting the plugins folder by FTP or phpMyAdmin? Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress?

– increasing the memory available to PHP?
https://www.ads-software.com/support/topic/253495#post-1017842

Thank you very much. It was the WP-Admin and WP-Include Folders.

-misschasse

I only needed to re-upload the wp-includes folder and that solved it for me.