we have installed "hp-application-automation-tools-plugin" plugin in Jenkins server and also configured Jenkins to execute Loadrunner scripts from ALM PC 12. Jenkins is able to login into ALM PC 12, but unable to execute the test. Below is the console output.
we are able to successfully run tests from PC 12.

Started by user anonymous
Building in workspace C:\Program Files (x86)\Jenkins\jobs\RunALM_LR12\workspace

• - -
  Test description: ALM_PC12
  Validating parameters before run
  Trying to login
  [PCServer='<ALMPC12_HostName>/loadtest', User='<MY User ID>']
  Login succeeded
  Sending run request
  [Domain='<DOmain Name>', Project='<Project Name>', TestID='5', TestInstanceID='5', TimeslotDuration='0:30(h:mm)', PostRunAction='Collate And Analyze']
  Logout succeeded
  Empty Results
  Result Status: UNSTABLE
• - -
  Build step 'Execute HP tests using HP Performance Center' changed build result to UNSTABLE
  Report not found
  Build step 'Publish HP tests result' changed build result to FAILURE
  Finished: FAILURE