CTGDIZ413E Entry Attribute 'xmlString' is missing

Web Service attribute Error:-

9:25:40,928 ERROR - [callws] CTGDIS810E handleException - cannot handle exception , functioncall

java.lang.Exception: CTGDIZ413E Entry Attribute 'xmlString' is missing.

                at com.ibm.di.fc.webservice.InvokeSoapWS.perform(InvokeSoapWS.java:343)

                at com.ibm.di.server.AssemblyLineComponent.executeOperation(AssemblyLineComponent.java:3336)

                at com.ibm.di.server.FunctionComponent.callreply(FunctionComponent.java:303)

                at com.ibm.di.server.AssemblyLine.msExecuteNextConnector(AssemblyLine.java:3750)

                at com.ibm.di.server.AssemblyLine.executeMainStep(AssemblyLine.java:3351)

                at com.ibm.di.server.AssemblyLine.executeMainLoop(AssemblyLine.java:2960)

                at com.ibm.di.server.AssemblyLine.executeMainLoop(AssemblyLine.java:2943)

                at com.ibm.di.server.AssemblyLine.executeAL(AssemblyLine.java:2912)

                at com.ibm.di.server.AssemblyLine.run(AssemblyLine.java:1311)

09:25:40,928 ERROR - CTGDIS266E Error in NextConnectorOperation. Exception occurred: java.lang.Exception: CTGDIZ413E Entry Attribute 'xmlString' is missing.

09:25:40,938 INFO  - CTGDIS100I Printing the Connector statistics.

09:25:40,938 INFO  -  [callws] Errors:1

09:25:40,938 INFO  - CTGDIS104I Total: Errors:2.

09:25:40,938 INFO  - CTGDIS101I Finished printing the Connector statistics.

09:25:40,938 ERROR - CTGDIS077I Failed with error: CTGDIZ413E Entry Attribute 'xmlString' is missing..

Solution:-  I did very simple mistake that I did not provide the value in 'xmlString' attribute in “invokeSoap web Service Function component”  so that’s why error coming so return some value in the 'xmlString' attribute after that it will surly call “Axis2 Web Service Server Connector”  

Hope this will help