Install error

[samprate1st]

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Continuing in 1 seconds...
Traceback (most recent call last):
File "", line 4, in
File "setup.py", line 216, in
main()
File "setup.py", line 88, in main
conf["CUDA_INC_DIR"] = [join(conf["CUDA_ROOT"], "include")]
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/posixpath.py", line 70, in join
elif path == '' or path.endswith('/'):
AttributeError: 'NoneType' object has no attribute 'ends with'