ERROR_WEBSERVICE_RUNTIME_INIT Error when instantiating the Web service runtime

Hi to all,

              i have created one proxy service and calling it through customer exit for production order (co02) .  while creating instance for proxy class i  m getting system fault( exception cx_ai_system_fault )

the code is  : -

TRY.
       CREATE OBJECT consumer_service
         EXPORTING
           logical_port_name = 'YSLP1'.

     CATCH cx_ai_system_fault into lo_system_ex .
       l_text_s = lo_system_ex->get_text( ).

   ENDTRY.

IN L_TEXT_S  i m getting erorr :

ERROR_WEBSERVICE_RUNTIME_INIT Error when instantiating the Web service runtime

Regards,

Manoj Rawat