I solved the problem. Thanks!
It was late at night when I solved it. That’s why I didn’t answer anymore.
Once I add an event comes the message “Trying to perform an illegal action”
When I’m logged in does not come this message. Settings on the calendar are ok.
Thanks for the note. The problem was indirectly with a plugin. I use to relieve a cache plugin. I have to empty the cache once. Now works !!
Thank you!
Thanks for the help. Works. Now works properly 🙂