RuntimeError: maximum recursion depth exceeded in cmp

Now I van connect but cannot receive mail . . .
RuntimeError: maximum recursion depth exceeded in cmp

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/openerp-server/netsvc.py", line 244, in dispatch
    result = LocalService(service_name)(method, *params)
  File "/usr/lib/python2.5/site-packages/openerp-server/netsvc.py", line 73, in __call__
    return getattr(self, method)(*params)
  File "/usr/lib/python2.5/site-packages/openerp-server/service/web_services.py", line 583, in execute
    res = service.execute(db, uid, object, method, *args)
  File "/usr/lib/python2.5/site-packages/openerp-server/osv/osv.py", line 61, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/openerp-server/osv/osv.py", line 120, in execute
    res = pool.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/lib/python2.5/site-packages/openerp-server/osv/osv.py", line 112, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/usr/lib/python2.5/site-packages/openerp-server/addons/poweremail/poweremail_mailbox.py", line 184, in search
    order, context=context, count=count)
         .
         . . . .
  File "/usr/lib/python2.5/site-packages/openerp-server/addons/poweremail/poweremail_mailbox.py", line 184, in search
    order, context=context, count=count)
  File "/usr/lib/python2.5/site-packages/openerp-server/addons/poweremail/poweremail_mailbox.py", line 184, in search
    order, context=context, count=count)
RuntimeError: maximum recursion depth exceeded in cmp