[gsoap] soap error:12,SOAP-ENV:Server,unknown

[yao.jack]

hi£¬
my linux gsoap client got response from server that "soap 
error:12,SOAP-ENV:Server,unknown", which 
printf("soap error:%d,%s,%s\n", add_soap.error, *soap_faultcode(&add_soap), 
*soap_faultstring(&add_soap) );
what is problem? thanks a lot.