Hue Emulation - Switch Item with Amazon echo dot leads to an error when turning on

I have defined a Switch item with the [ “Switchable” ] tag for the hueemulation addon. (OpenHAB 2.3 release)

When switching the item on via my amazon echo dot it works but the echo is responding with the following phrase in german: “der wert liegt außehalb des bereichs für das gerät …” Turning the device off works without any errors.

Has anybody an idea whats wrong here?