[Serusers] error when initializating module acc

I have a problem with my SER configuration .when I start ser,the error happens like this: _______________________________________________________________________ [root@localhost local]# ser -E -D 0(2796) WARNING: could not rev. resolve 135.252.20.230 Listening on 127.0.0.1 [127.0.0.1]:5060 135.252.20.230 [135.252.20.230]:5060 Aliases: localhost:5060 localhost.localdomain:5060 WARNING: no fork mode and more than one listen address found (will use only the the first one) stateless - initializing Maxfwd module- initializing acc - initializing 0(2796) ERROR: acc: can't get code for the Failed attribute value 0(2796) init_mod(): Error while initializing module acc ERROR: error while initializing modules ________________________________________________________________________ Does anyone know about this ? Need your help! Regards.