Re: Understanding command lines.

I changed EXTRUDERS from 1 to 2 and got the same error.

Changed in Configuration.h

#ifndef MOTHERBOARD
//#define MOTHERBOARD BOARD_RAMPS_14_EFB => EFB = extruder fan bed change to ext ext bed = EEB
#define MOTHERBOARD BOARD_RAMPS_14_EEB
#endif

#define TEMP_SENSOR_1 0 => change to sensor # ,probably same as TEMP_SENSOR_0

Program compiled ok.