Hi Michal and Dimas,
1. Thanks for the support given, php errors are not showing anymore, but I noticed that now all my server is lagged, the response time is really high and It was normal last night.
2. I forgot to say that after I installed Guru Pro this error appears, and I have problems with Kunena integration, my course-lessons categories at the forum appear with 404 error, but I can see user comments right below the lesson:
1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 SQL=INSERT INTO `cocoa_user_usergroup_map` (`user_id`, `group_id`) VALUES (64, )
3. I can see now a new Guru version 3.1.8, I just updated it, no problem was detected, but after creating again a new course, module and lessons, the kunena error keeps appearing, so I think that is an error with the integration plug-in.
Thanks again for the support