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Thank you Leo.
Yes, I've reinstalled it many times.
Besides, unfortunately, another problem has occurred
I've updated the category tree official module.
After that when I now open the admin panel login page an HTTP 500 error occurr.
I cannot see any error in F12.
I've tried to disable this module via database, but problem persist.
So I can't access anymore in my admin panel.

Sorry, I know I'm off-topic, but I'm very discouraged at now.

If you have any ideas I'll thank you.
Otherwise I'll open another topic for this, after doing some search.

Regards
Pietro