Hi. This happens when you try to run the service executable, instead of installing it. It is a Windows service that needs to be installed with installutil.exe instead. I have included installutiil.exe in the zip file, but usually the easiest way to install the service is to just run setup.exe. Please check the other files provided, there is one 'with setup', if you extract that file, there is a setup.exe that you can run, and it should install the Windows service for you. Thanks.