Errors running the project found in solutions


#1

I tried myself to write the project about this chapter, and it was working but for some reason I messed it up, and I didn’t backup it, so I decided to download the solutions.
But if I try to compile the project, when I run the application the window doesn’t load, and I get this message printed in the console:

2012-10-31 01:01:17.464 Departments[3036:303] Cannot create BOOL from object (
) of class _NSControllerArrayProxy
2012-10-31 01:01:17.478 Departments[3036:303] Cannot create BOOL from object (
) of class _NSControllerArrayProxy

Maybe this is because I use a newer version of xcode, I am on mountain lion, with xcode 4.5 .
I can’t understand the reason of this error, could someone explain how to correct it and run the application without problems?