PC SDK As Service?

I'm having trouble running a program developed with the PC SDK as a service.
When calling or setting the controller, the DLL >ABB.Robotics.Controllers.PC.dll< throws an error.
>The type initializer for "ABB.Robotics.Controllers.Controller" threw an exception.<
This my Code:
"mController = Controller.Connect(mAnlage.GUI, ConnectionType.Standalone)"
Where "mController = ABB.Robotics.Controllers.Controller"
I read the GUI beforehand with a WindowsForm app and also assigned the controller with it. It doesn't seem to work in a service. The same result when I try to assign a controller via the ControllerInfoCollection. The Netscanner also throws errors in a service when initializing. Is there any workaround?