Check Incoming Connection

I configured the Server & User Information and after clicking on "Check Outgoing Connection" I got a mistake:

Environment Information :
System : Windows-XP-5.1.2600-SP3
OS Name : nt
Operating System Release : XP
Operating System Version : 5.1.2600
Operating System Architecture : 32bit
Operating System Locale : de_DE.cp1252
Python Version : 2.5.2
OpenERP-Client Version : 5.0.4
Last revision No. & ID :Bazaar Package not Found !Traceback (most recent call last):
  File "/usr/lib/openerp-server/netsvc.py", line 244, in dispatch
    result = LocalService(service_name)(method, *params)
  File "/usr/lib/openerp-server/netsvc.py", line 73, in __call__
    return getattr(self, method)(*params)
  File "/usr/lib/openerp-server/service/web_services.py", line 583, in execute
    res = service.execute(db, uid, object, method, *args)
  File "/usr/lib/openerp-server/osv/osv.py", line 59, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/lib/openerp-server/osv/osv.py", line 118, in execute
    res = pool.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/lib/openerp-server/osv/osv.py", line 110, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
AttributeError: 'poweremail_core_accounts' object has no attribute '_check_outgoing_connection'

Using latest trunc191

thanks
maddus