CoreData: error: (14) I/O error for database

Question

When compiling and running in the XCode a project using Core Data I\'m getting an error I never saw before:

 2013-09-12 16:59:10.156 myapp[57811         


        

Answer 1

NSURL *storeURL = [[NSBundle mainBundle] 
                     URLForResource:@"database" withExtension:@"sqlite"];

builds a path inside the application bundle, which is read-only. The persistent store file needs to reside in a writable directory, e.g. the "Documents" directory.

EDIT: The above answer is actually wrong, it is possible to open a read-only Core Data file from the application bundle (using NSReadOnlyPersistentStoreOption). The only thing I can currently imagine is that the bundled file is not a valid Core Data database. Adding the launch argument

-com.apple.CoreData.SQLDebug 1

might help to localize the problem.