Xcode acting strange

Question

I am typing code from Head First iPhone Development (O'reilly) and Xcode will build and run fine once and then, without any modification to the code, the second build will fail. Why?(I'm using command+R)

EDIT:

the first error was something similar to "can not take an object as an argument."

Answer 1

i think you must miss some proper argument which should be a pointer type in your method declaration.