Failure: RuntimeError (dictionary changed size during iteration) ... ERROR

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ERROR: Failure: RuntimeError (dictionary changed size during iteration)
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Traceback (most recent call last):
  File "/usr/lib/python3.3/site-packages/nose/failure.py", line 37, in runTest
    raise self.exc_class(self.exc_val).with_traceback(self.tb)
  File "/usr/lib/python3.3/site-packages/nose/loader.py", line 379, in loadTestsFromName
    module = resolve_name(addr.module)
  File "/usr/lib/python3.3/site-packages/nose/util.py", line 321, in resolve_name
    module = __import__('.'.join(parts_copy))
  File "/home/pcpa/rpmbuild/BUILD/matplotlib-1.2.0/lib/matplotlib/__init__.py", line 151, in <module>
    from matplotlib.rcsetup import (defaultParams,
  File "/home/pcpa/rpmbuild/BUILD/matplotlib-1.2.0/lib/matplotlib/rcsetup.py", line 20, in <module>
    from matplotlib.colors import is_color_like
  File "/home/pcpa/rpmbuild/BUILD/matplotlib-1.2.0/lib/matplotlib/colors.py", line 205, in <module>
    for k, v in cnames.items():
RuntimeError: dictionary changed size during iteration

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (errors=1)