The name of the REST Web application's paar file that you want to unpublish. You must provide only the service name, and not the complete filename and extension.
For example, you must provide myService as your service name, instead of myService.paar.
Notes
The unpublish command throws an error if you try to undeploy a web service of REST Web application that has only one service deployed on the Web server. Therefore, a REST Web application must have at least two Web services (paar files) deployed on the Web server for you to be able to unpublish one of the available services of the REST Web application.