Problem found and solvd
The Problem is the merged-template-prepend.js.deps file. I know, i said first it isnt, but it was.
2 Steps to solve this:
Step one
nano /**YOUR PATH TO NC DATA**/nc_data/appdata_BLABLA/js/core/merged-template-prepend.js.deps
Just open the file, save it, leave it. (we need a new empty file)
Step 2
give them rights
chmod 777 /you_know_your_path/merged-template-prepend.js.deps
Restart the system and everythink works fine.
Why is the file deleted? i dont know.
I found the solution here:
open for comments how to avoid it