Unable to get metadata for IDoc Type - URGENTLY

I am getting this error while posting message from WebMethods to SAP system.Please help me what might be cause for this error message.

[ART.117.4002] Adapter Runtime (Adapter Service): Unable to invoke adapter service pub.sap.transport.ALE:OutboundProcess.
[SAP.102.9000] JCo error: com.sap.conn.idoc.IDocRuntimeException - Unable to get metadata for ZIRMORDCNF01