I am trying to import (in bulk) users into the system (Settings -> Users -> Export). I keep getting errors, I tried exporting a few users to understand the schema used for users but instead I got the following error: <title>500 Internal Server Error</title>

Internal Server Error

{"message": "OpenERP WebClient Error", "code": 300, "data": {"debug": "Client Traceback (most recent call last):\n File \"/home/test/openerp-7/openerp/addons/web/http.py\", line 285, in dispatch\n r = method(self, **self.params)\nTypeError: index() takes exactly 4 arguments (2 given)\n", "type": "client_exception"}