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Mar 15 at 0:09 comment added Armored Wolf Well, the error above says specifically that None is being returned instead of a Set (like {'FINISHED'} OR {'CANCELLED'}. Using curly braces {} is how you define a Set in Python, so for some reason you never reach the correct return value.
Mar 14 at 21:49 comment added arpit I am aware of return type and did check my code after your post. I always return {"FINISHED"} at the end of execute function. I am wondering what happens if my code in the execute fails. Would blender automatically return {"CANCELLED"} or other valid return value? Or I need to do error checking and return a valid value?
Mar 14 at 20:26 history answered Armored Wolf CC BY-SA 4.0