SAP Message S03438 - Cannot read list of solutions (Error &1 &2)

Diagnosis
An error occurred while calling the function module DMD_GET_SOLUTION.The system cannot read the list of solutions for a specified datamodel.

System Response
Error 1: no_authorization
Error 2: model_not_found
Error 3: communication_failure
Error 4: system_failure
Error 5: Other

Procedure
Check the data model key and the RFC destination for the solutionmanager system.