Here are correct lines: // X and Y offsets must be integers #define X_PROBE_OFFSET_FROM_EXTRUDER -28 #define Y_PROBE_OFFSET_FROM_EXTRUDER +10 I had same error: // X and Y offsets must be integers integers are 1,2,3,10,20 NOT 28.1 or 28.0 II not 10.1 or 10.0 by Marlin logicby anttdk - Reprappers