It's that time again....

This time, I have problems working with parentheses. It's currently saying that void Quit() is wrong, because of the parentheses. The error it gives is:

Syntax error, unexpected lparen, expecting assing, on token (.

How is that wrong?! If I put a space so it looks like void Quit (), it's STILL wrong. So, in other words, it's saying that void Quit() isn't a valid arguement! What is going on here?