Error compiling for board Arduino Uno

hello, I have received this error when trying to compiling to board any help would be brilliant

Thanks, J

/var/folders/rl/n70j7fl97mdd63t3mks1rl1r0000gn/T//cc7ShMut.ltrans0.ltrans.o: In function main': /Applications/ undefined reference toloop' collect2: error: ld returned 1 exit status exit status 1 Error compiling for board Arduino Uno.

Every Arduino sketch must have a setup() and a loop() function. Even if you don't want to put any code in the function, you still need to define the empty function. You are getting this error because your sketch does not have a loop() function.