Weird Error

I have /home on my desktop mounted as a NFS share. It has worked very well until now. I was doing some coding on Toms TV Utility today and after adding some new unit tests, I started getting a strange error:

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.5/nose/case.py", line 364, in setUp
    try_run(self.inst, ('setup', 'setUp'))
  File "/usr/lib/pymodules/python2.5/nose/util.py", line 487, in try_run
    return func()
  File "/home/tlow/projects/tomstvutil/0.0.1dev/tests/test_tomstv.py", line 22, in setUp
    ignore_hidden=False)
  File "build/bdist.linux-i686/egg/scripttest/__init__.py", line 73, in __init__
  File "build/bdist.linux-i686/egg/scripttest/__init__.py", line 203, in clear
  File "/usr/lib/python2.5/shutil.py", line 175, in rmtree
    rmtree(fullname, ignore_errors, onerror)
  File "/usr/lib/python2.5/shutil.py", line 180, in rmtree
    onerror(os.remove, fullname, sys.exc_info())
  File "/usr/lib/python2.5/shutil.py", line 178, in rmtree
    os.remove(fullname)
OSError: [Errno 16] Device or resource busy: '/home/tlow/projects/tomstvutil/0.0.1dev/tests/test-output/.tv/.nfs00000000000005ea00000004'

The new unit tests needed a test fixture and it looks like the setup method is causing this.

Hopefully some Googling with turn up something and the problem won't hold up the coding too long which was going rather well the last few days.