I'm building a web service client.

I've used many other functions from this web service, i've finished most of this work. But now i'm getting this error "External exception C000001E" as i try to use the function as example below.

  Var

  asi_              : Asi.MCCI_AR000001TR_PortType;
  asi_Istek         : Asi.QUQI_IN000001TR01;
  asi_Cevap         : Asi.QUQI_IN000002TR01;

  Begin

   // bla.. blaa. setting wsse header etc. giving httprio parameters .. 
   // bla... blaa.. some code here , creating the asi_Istek, setting the values etc.

  Try
   asi_Cevap := asi_.MCCI_AR000001TR_QUQI_IN000001TR(asi_Istek); // **error**
  Except
   On e: Exception Do
    Begin
      ShowMessage(e.Message);  // External exception C000001E
    End;
   End; 

that is sample code, my code is something like that, and i've many other smilar functions of this webservice, which are working without error, but here is missing something but what ? what is the "External exception C000001E" has anyone idea ?

thanks.