Invalid tetra in TetraMesh

I cannot solve the problem of “invalid tetra in TetraMesh” when creating mesh from point cloud using alpha shape on Windows 10. I installed the Open3d library in anaconda virtual environment using conda commend. Also I found a post about this issue on Github in which the problem was solved from “hard fail” to “soft fail” by changing some code in cpp source file. But honestly, I don’t know how to change the codes in source file as I cannot find the cpp source file in the site-packages of anaconda library.
Can somebody help me with this problem?
Thanks in advanced.