Facebook Events is working now.
I installed first facebook events and then the events calendar, i always did it the other way. Now it works.
But the Event Widget is still not working, it says: There are no upcoming events at this time
I tryed both… i replaced the files per FTP and i tried in WP backend but always the same message is coming: To begin using The Events Calendar: Facebook Events, please install the latest version of The Events Calendar.