In file included from temperature.cpp:32:0:
temperature.cpp: In function 'void manage_heater()':
Marlin.h:69:52: error: void value not ignored as it ought to be
 #define SERIAL_ECHO_START (serialprintPGM(echomagic))
                                                    ^
temperature.cpp:446:5: note: in expansion of macro 'SERIAL_ECHO_START'
     SERIAL_ECHO_START(" PIDDEBUG ");

SERIAL_ECHO_START;
SERIAL_ECHO(" PIDDEBUG ");