Cannot uninstall

When trying to uninstall User Relationship Locator Graph (has to be uninstalled first), you get an HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfil the request.

As far as I can tell, this is an error within the module but am continuing to investigate further and will post if I discover otherwise, but thought I would open the issue in case anyone else is experiencing the same.