You are using a very old version of WordNet-Similarity (0.03). Try a newer release, I think that will resolve the problem. There was a change in WordNet-QueryData as of WordNet 3.0 in how versions are handled, since WordNet no longer provides a reliable version number. So, an older release of WordNet-Similarity when used with WordNet 3.0 will run into problems because of that. Good luck, Ted