When the code found on pg. 256 of the book is activated in my program, I encounter the following error. When I deactivate the code for saving or loading task data then the errors go away.
Undefined symbols for architecture i386:
"_BNRDocPath", referenced from:
-[BNRAppDelegate application:didFinishLaunchingWithOptions:] in BNRAppDelegate.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)