Hi Irith,
Although I can't read Hebrew, I'm guessing this is in a course of some sorts? What course format are you using, and have you checked whether that is compatible and supported with Moodle 3.11?
I repeated twice the upgrade action so now most of the problem disapeared now the problem that still exist is that I can"t edit an activity
I click on the edit button and its not doing anything
Have you checked whether the course will load if you switch to the core Topics format? What tabbed course format are you using? And have you checked whether that course format is up to date and compatible with 3.11?