Thanks for the reply.
It is not a test site.
I solved it by uninstalling seblod.
By installing joomla clean.
Reinstalled all components
Reinstalling Seblod.
Now, almost ok ...
I have another problem, I can not see all of my articles, the error is: You are not authorized to view this resource.
I tried to write a new article, to create a new menu item, but the problem is always the same.
thanks