Scheduler Service Issues

I'm trying to automate the execution of a server method, but after installing the Aras Scheduler Service and filling out the InnovatorServiceConfig file, the scheduled method does not execute. I can see InnovatorService trying to execute the method in Windows Event Viewer. It says "Method finished" in Event Viewer, but then shows the error "The last run was less than an Interval ago" and the method does not execute. I can execute the method fine and see changes in the database if I go to Actions>Run Server Method in Aras, but the attempts by the Scheduler Service make no difference to the specified database.