When buying a Kaercher Mobile HPW (https://ls-portal.eu/de/karcher-mobile-hpw/) it gets a LUA callstack:
Error: Running LUA method 'update'.
C:/Users/Sonja/Documents/ModManager/Sibbershusum/FS17_RM_soilCompaction/src/vehicles/scSoilCompaction.lua:346: attempt to call method 'isPlayerInRange' (a boolean value)
Maybe its colliding with PressureWasher.lua of the Kaercher, where "isPlayerInRange" is also used.