import pcl & from pclpy import pcl can't work at same time

[xyuhuang]

I can't import both of these libraries at the same time. One of them always shows 'ImportError: DLL load failed: The specified module could not be found'.
Solved import pclpy and it went wrong with import pcl. And vice versa.
Is there a conflict between them? They don't seem to work at the same time.