Since it is not a LineShape does not have Remove method. Look at that code
File "/Users/humberto.a.sanchez.ii/PycharmProjects/PyUt/src/org/pyut/miniogl/LinePoint.py", line 41, in Detach
line.Remove(self)
AttributeError: 'OglInterface2' object has no attribute 'Remove'
SelectAnchorPoint: EAST
Since it is not a LineShape does not have Remove method. Look at that code