error complining marlin 2.0 sketch

Arduino:1.8.12 (Windows 10), Kart:"Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"

In file included from sketch\src\inc/MarlinConfig.h:40:0,

from sketch\src\MarlinCore.h:24,

from sketch\src\MarlinCore.cpp:31:

sketch\src\inc/SanityCheck.h:1568:4: error: #error "HEATER_1_PIN not defined for this board."

#error "HEATER_1_PIN not defined for this board."

^

sketch\src\inc/SanityCheck.h:1575:6: error: #error "TEMP_SENSOR_1 is required with 2 or more HOTENDS."

#error "TEMP_SENSOR_1 is required with 2 or more HOTENDS."

^

In file included from sketch\src\HAL\AVR../../inc/MarlinConfig.h:40:0,

from sketch\src\HAL\AVR\HAL.cpp:25:

sketch\src\HAL\AVR../../inc/SanityCheck.h:1568:4: error: #error "HEATER_1_PIN not defined for this board."

#error "HEATER_1_PIN not defined for this board."

^

sketch\src\HAL\AVR../../inc/SanityCheck.h:1575:6: error: #error "TEMP_SENSOR_1 is required with 2 or more HOTENDS."

#error "TEMP_SENSOR_1 is required with 2 or more HOTENDS."

^

In file included from sketch\src\HAL\AVR../../inc/MarlinConfig.h:40:0,

from sketch\src\HAL\AVR\HAL_SPI.cpp:34:

sketch\src\HAL\AVR../../inc/SanityCheck.h:1568:4: error: #error "HEATER_1_PIN not defined for this board."

#error "HEATER_1_PIN not defined for this board."

^

sketch\src\HAL\AVR../../inc/SanityCheck.h:1575:6: error: #error "TEMP_SENSOR_1 is required with 2 or more HOTENDS."

#error "TEMP_SENSOR_1 is required with 2 or more HOTENDS."

^

exit status 1
Arduino/Genuino Mega or Mega 2560 kartı için derleme hatası.

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PLEASE HELP ME

I WAS GOİNG TO CRAZY WHAT CAN I SOLVE THİS PRFOBLEM?