ERROR:web-services:Uncaught exception
Traceback (most recent call last):
  File "/home/eiji/Openerp/openerp-server-6.0.2/bin/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/eiji/Openerp/openerp-server-6.0.2/bin/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/eiji/Openerp/openerp-server-6.0.2/bin/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/addons/base/module/wizard/base_module_upgrade.py", line 98, in upgrade_module
    _db, pool = pooler.restart_pool(cr.dbname, update_module=True)
  File "/home/eiji/Openerp/openerp-server-6.0.2/bin/pooler.py", line 60, in restart_pool
    return get_db_and_pool(db_name, force_demo, status, update_module=update_module)
  File "/home/eiji/Openerp/openerp-server-6.0.2/bin/pooler.py", line 39, in get_db_and_pool
    addons.load_modules(db, force_demo, status, update_module)
  File "/home/eiji/Openerp/openerp-server-6.0.2/bin/addons/__init__.py", line 883, in load_modules
    processed_modules.extend(load_module_graph(cr, graph, status, report=report, skip_modules=processed_modules))
  File "/home/eiji/Openerp/openerp-server-6.0.2/bin/addons/__init__.py", line 717, in load_module_graph
    modules = pool.instanciate(package.name, cr)
  File "/home/eiji/Openerp/openerp-server-6.0.2/bin/osv/osv.py", line 258, in instanciate
    res.append(klass.createInstance(self, module, cr))
  File "/home/eiji/Openerp/openerp-server-6.0.2/bin/osv/osv.py", line 331, in createInstance
    assert pool.get(parent_name), "parent class %s does not exist in module %s !" % (parent_name, module)
AssertionError: parent class res.partner.contact does not exist in module cms !