Ensure you have the P8_Lightpack_v1.4.scs (or .zip ) file.
Officially supported for 1.44 (though newer versions may work with updated community patches). Pachet de lumini И™i accesorii Powerkasi v1.4 1.44
Highly recommended for use with RJL's Scania R & Streamline and P8 Scania RS Addons . Ensure you have the P8_Lightpack_v1