getting exit status 1 on arduino pro micro (Leonardo)

[pert]

GeeDeexd:
C:\Users\Dennis\AppData\Local\Temp\ccOvg7cT.ltrans0.ltrans.o: In function `main':

C:\Users\Dennis\Documents\ArduinoData\packages\arduino\hardware\avr\1.6.21\cores\arduino/main.cpp:46: undefined reference to `loop'

Every Arduino sketch must contain a loop function, even if it's left empty.