Hi ,
i manage to solve the problem, all my blender addons were installed into:
C:\Users\AppData\Roaming\Blender Foundation\Blender\2.83\scripts\addons\UE4Workspace
i think there was a space in the middle causing the python script to behave incorrectly.
now i change my addon into a new folders without space like this:
C:\Users\Documents\Blender\Addon\addons\UE4Workspace
and the script is working correctly now.
