Cannot activate HTML mode

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 available memory?
https://www.ads-software.com/extend/plugins/memory-bump/
https://www.ads-software.com/support/topic/253495#post-1017842

– reviewing https://www.ads-software.com/support/topic/411649

Thank you. I will try it and tell you later.

Yes, Your first solution worked well. My flash plug-in was the problem. Thank you.