Can anybody know how to resolve the following error?

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I am repeatedly getting the following error while running the eigenvalue analysis. I have tried with different systems (sav, dyr files) even then I am getting same error. could any body how to resolve it?

NEVA Launch script pssneva.py (Vs-19/2011-05-03)

traceback (most recent call last): File ".\pssneva.py", line 882, in <module> File ".\pssneva.py", line 99, in getnetomac_path TypeError xceptions must be old-style classes or derived from BaseException, not str

Thanks