Cannot edit dashlet

Hello,
I want to resize my dashlets for suitecrm, but when i click on edit(the pen of dashlets) an error occured :

I tried to install suitecrm 7.5, 7.5.1 and 7.5.3 and of them gives the same error :angry:
Any idea ?!

Sorry that mine is a generic answer, but since nobody is answering you anyway…

Try a “Quick repair and rebuild”.

Try removing the dashlet, log off, log in, recreate it.

Check log files for errors.

I actually did it, quick repair and rebuild, clean cache, … But the problem stills the same.