Which specific version of Marlin are you compiling, which version of the Arduino IDE, which operation system, and for which 3D printer? Preferably post a link to the Configuration.h and Configuration_adv.h files if you downloaded them.
Which specific version of Marlin are you compiling, which version of the Arduino IDE, which operation system, and for which 3D printer? Preferably post a link to the Configuration.h and Configuration_adv.h files if you downloaded them.