a traceback error when I try Vocola

[http://dummy.us.eu.org/robert (robert)]

I get this traceback when I try Vocola:

Traceback (most recent call last):
  File "c:\nalink007\macrosystem\natlinkutils.py", line 511, in resultsCallback
    self.callIfExists( 'gotResults_'+x[1], (x[0], fullResults) )
  File "c:\nalink007\macrosystem\natlinkutils.py", line 210, in callIfExists
    else: apply(func, argList)
  File "c:\nalink007\macrosystem\_vocola_main.py", line 33, in gotResults_1
    self.setNames()
  File "c:\nalink007\macrosystem\_vocola_main.py", line 71, in setNames
    self.machine = string.lower(os.environ['COMPUTERNAME'])
  File "C:\Python20\Lib\os.py", line 292, in __getitem__
    return self.data[key.upper()]
KeyError: COMPUTERNAME

What am I missing and what do I need to do?  Is this a registry thing?

Thanks.