@macmanx, thanks a lot. I did as you sad, deactivated all plugins (still errormsg), installed and activated twentyseventeen-theme. Unfortunately nothing helped.., still the error. I think I will completely deinstall everything and create it new.
@christineonthebrighterside, thanks for your reply. This is a really strange problem, I’m happy for you it disappeared :). So I can still pray ;-). But as I wrote.., I will make it all new. It’s time anyway for this and a chance to update things.
