[social network]server error when uninstalling module

[tongro]

I'm just trying out OpenERP, installed from the package openerp_7.0-20130205-000102-1_all.deb , using Firefox 18 on Debian Squeeze. There were no installation problems.

I'm currently setting up the first company. When I uninstalled the "Social Network" module, I got the error message below, and since then the whole system seems to be broken: I get nothing but empty pages (the menu and headings are there but nothing else) and various error messages.

Thanks.

Tony.

Error message:
-----

OpenERP Server Error

Client Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/openerp/addons/web/http.py", line 195, in dispatch
    response["result"] = method(self, **self.params)
  File "/usr/lib/pymodules/python2.6/openerp/addons/web/controllers/main.py", line 1082, in call_button
    action = self._call_kw(req, model, method, args, {})
  File "/usr/lib/pymodules/python2.6/openerp/addons/web/controllers/main.py", line 1070, in _call_kw
    return getattr(req.session.model(model), method)(*args, **kwargs)
  File "/usr/lib/pymodules/python2.6/openerp/addons/web/session.py", line 43, in proxy
    result = self.proxy.execute_kw(self.session._db, self.session._uid, self.session._password, self.model, method, args, kw)
  File "/usr/lib/pymodules/python2.6/openerp/addons/web/session.py", line 31, in proxy_method
    result = self.session.send(self.service_name, method, *args)
  File "/usr/lib/pymodules/python2.6/openerp/addons/web/session.py", line 104, in send
    raise xmlrpclib.Fault(openerp.tools.ustr(e), formatted_info)

Server Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/openerp/addons/web/session.py", line 90, in send
    return openerp.netsvc.dispatch_rpc(service_name, method, args)
  File "/usr/lib/pymodules/python2.6/openerp/netsvc.py", line 289, in dispatch_rpc
    result = ExportService.getService(service_name).dispatch(method, params)
  File "/usr/lib/pymodules/python2.6/openerp/service/web_services.py", line 614, in dispatch
    res = fn(db, uid, *params)
  File "/usr/lib/pymodules/python2.6/openerp/osv/osv.py", line 169, in execute_kw
    return self.execute(db, uid, obj, method, *args, **kw or {})
  File "/usr/lib/pymodules/python2.6/openerp/osv/osv.py", line 123, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/lib/pymodules/python2.6/openerp/osv/osv.py", line 179, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/lib/pymodules/python2.6/openerp/osv/osv.py", line 166, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/usr/lib/pymodules/python2.6/openerp/addons/base/module/module.py", line 496, in button_immediate_uninstall
    return self._button_immediate_function(cr, uid, ids, self.button_uninstall, context=context)
  File "/usr/lib/pymodules/python2.6/openerp/addons/base/module/module.py", line 478, in _button_immediate_function
    config = pool.get('res.config').next(cr, uid, [], context=context) or {}
  File "/usr/lib/pymodules/python2.6/openerp/addons/base/res/res_config.py", line 88, in next
    return self._next(cr, uid, context=context)
  File "/usr/lib/pymodules/python2.6/openerp/addons/base/res/res_config.py", line 66, in _next
    next = self._next_action(cr, uid, context=context)
  File "/usr/lib/pymodules/python2.6/openerp/addons/base/res/res_config.py", line 51, in _next_action
    self.pool['res.users'].browse(cr, uid, [uid], context=context)[0].groups_id))
  File "/usr/lib/pymodules/python2.6/openerp/osv/orm.py", line 486, in __getattr__
    raise AttributeError(e)
AttributeError: 'alias_id'