Leave Request Approver mail showing error in UWL

Hi,

When the employee books the leave in ESS, the manager gets a mail in his UWL. When the manager opens the mail, he gets the below error which does not allow him to take any action.

URL https://host:8000/webdynpro/dispatcher/sap.com/ess~lea/LeaveRequestApprover call was terminated because the corresponding service is not available.

I have maintained the parameters for the leave task TS12300097 in SWFVISU:

APPLICATION               LeaveRequestApprover

DYNPARAM                 wi_id=${item.externalId}

PACKAGE                    sap.com/ess~lea

SYSTEM_ALIAS           SAP_WebDynpro_XSS

I have maintained the system alias SAP_WebDynpro_XSS in the Webflow connector Launch system under  System Administration -> System Configuration -> UWL Adminsitration. After that Re-Register the Webflow connector. Clear the caches.

Still getting the same error. Kindly suggest.

Thanks...