ARGOMENTO: Selezione utenti da associare ad un Access Group

Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/service/web_services.py", line 599, in dispatch
    res = fn(db, uid, *params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/addons/audittrail/audittrail.py", line 511, in execute
    res = my_fct(db, uid, model, method, *args)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/addons/audittrail/audittrail.py", line 495, in my_fct
    return fct_src(db, uid, model, method, *args)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/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/osv/orm.py", line 1735, in search
    return self._search(cr, user, args, offset=offset, limit=limit, order=order, context=context, count=count)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/osv/orm.py", line 3981, in _search
    cr.execute('SELECT "%s".id FROM ' % self._table + from_clause + where_str + order_by + limit_str + offset_str, where_clause_params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/sql_db.py", line 78, in wrapper
    return f(self, *args, **kwargs)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/sql_db.py", line 131, in execute
    res = self._obj.execute(query, params)
DataError: LIMIT must not be negative