Schello805 on "[Plugin: Image Gallery] Server fail 500"

Hello,

i moved my wordpress domain to hosteurope and in the end, all seems to be working.
I want to delete an old picture in a gallery, but i get a blank screen with the error message.

http://schellenberger-brushes.com/wp-content/uploads/2015/11/Unbenannt.png

All other plugin still working, i hope anyone knows the answer.

https://wordpress.org/plugins/gallery-images/