c:/users/andrew/appdata/local/arduino15/packages/proffieboard/tools/arm-none-eabi-gcc/9-2020-q2-update/bin/../lib/gcc/arm-none-eabi/9.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\Andrew\AppData\Local\Temp\ProffieOS.ino.elf.HLFBYY.ltrans0.ltrans.o: in function `main':
C:\Users\Andrew\AppData\Local\Arduino15\packages\proffieboard\hardware\stm32l4\3.6\cores\stm32l4/main.cpp:129: undefined reference to `setup'
c:/users/andrew/appdata/local/arduino15/packages/proffieboard/tools/arm-none-eabi-gcc/9-2020-q2-update/bin/../lib/gcc/arm-none-eabi/9.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\Andrew\AppData\Local\Arduino15\packages\proffieboard\hardware\stm32l4\3.6\cores\stm32l4/main.cpp:133: undefined reference to `loop'
collect2.exe: error: ld returned 1 exit status

exit status 1

Compilation error: exit status 1