i made a class to make a panel with button in object properties. But now, i want to remove it. I tried to 'unregister' that class again..but there are still that panel & button in object properties. Any Idea what i should do?
unregister and hit F8 to reload scripts. You may also restart Blender. If it still shows, then you probably made it internal or saved as .py in Blender's script search paths. (Re)move it and restart
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