The administration service is running so all administration jobs will be run in the timer service.

Environment: SharePoint 2013

Scenario: Tried to run the following powershell cmdlet to execute all administrative timer jobs immediately rather than waiting for the timer job to run.

 Start-SPAdminJob

 Issue: Command failed and got following error message

 Error: Start-SPAdminJob : The administration service is running so all administration jobs will be run in the timer service.

 Resolution: 

Go to Services.msc and stop the SharePoint Administration service and try again. Start the service once the command is completed executing.

 Alternatively use net stop SPAdminV4 and net start SPAdminV4 cmdlet to stop and start the SharePoint Administration service