clarkwinkelmann Incredibly, this was the cause. I ran that the command flarum cache it but evidently it did not delete the cache, why?
Clearing the cache manually, as suggested by you, worked right away.
Thank you very much really, you are very kind.
I only noticed that in the administrator panel, in the dashboard, nothing appears.
In the other sections everything is fine.
https://ibb.co/54vZRxj