Traceback (most recent call last):


 "/Users/jimmygunawan/Library/Application Support/Blender/2.82/scripts/addons/sverchok-master/nodes/generator/script1_lite.py", line 422, in process_script

exec(self.script_str, locals(), locals())


 "<string>", line 40, in <module>
TypeError: object of type 'NoneType' has no len()

Traceback (most recent call last):


 "<stdin>", line 1, in <module>
TypeError: diff() takes exactly 1 argument (2 given)
