Traceback (most recent call last):
  File "<console>", line 1, in ?
  File "/Users/patrick/.buildout/eggs/transaction-1.0.0-py2.4.egg/transaction/_manager.py", line 93, in commit
    return self.get().commit()
  File "/Users/patrick/.buildout/eggs/transaction-1.0.0-py2.4.egg/transaction/_transaction.py", line 322, in commit
    self._commitResources()
  File "/Users/patrick/.buildout/eggs/transaction-1.0.0-py2.4.egg/transaction/_transaction.py", line 416, in _commitResources
    rm.commit(self)
  File "/Users/patrick/.buildout/eggs/ZODB3-3.9.1-py2.4-macosx-10.6-i386.egg/ZODB/Connection.py", line 554, in commit
    self._commit(transaction)
  File "/Users/patrick/.buildout/eggs/ZODB3-3.9.1-py2.4-macosx-10.6-i386.egg/ZODB/Connection.py", line 602, in _commit
    self._store_objects(ObjectWriter(obj), transaction)
  File "/Users/patrick/.buildout/eggs/ZODB3-3.9.1-py2.4-macosx-10.6-i386.egg/ZODB/Connection.py", line 647, in _store_objects
    '', transaction)
  File "/Users/patrick/.buildout/eggs/ZODB3-3.9.1-py2.4-macosx-10.6-i386.egg/ZEO/ClientStorage.py", line 933, in storeBlob
    ZODB.blob.rename_or_copy_blob(blobfilename, target)
  File "/Users/patrick/.buildout/eggs/ZODB3-3.9.1-py2.4-macosx-10.6-i386.egg/ZODB/blob.py", line 902, in rename_or_copy_blob
    os.rename(f1, f2)
TypeError: coercing to Unicode: need string or buffer, NoneType found