Get some problems when adding my own robot

[danielgf0824]

Hi, recently i'm using PyRep+CoppeliaSim for research works. While running unit test for my own robot, I met a problem and was unable to solve it.
For more specifically, i followed the "Adding Robots" chapter, like loading my robot from a urdf file, renaming the links and joints, adding child script, the collection and Kinematics things. Also I exported the model as a ttm file and added my python file in pyrep/robots/arm dir.
BUT, in the unit test, handle can not be found