What's wrong with my copy here?

I'm trying to copy a file from my application bundle to my app's documents directory. I'm getting an error, "Cocoa Error 262". What am I doing wrong? Here's my code:

    NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"CoreData.sqlite"];
NSURL *initialURL = [NSURL URLWithString:[[NSBundle mainBundle] pathForResource:@"CoreData" ofType:@"sqlite"]];

NSError *error = nil;

if (![[NSFileManager defaultManager] fileExistsAtPath:[initialURL absoluteString]]) {
    NSLog(@"Original does not exist. \nPath: %@", [initialURL absoluteString]);
}  

if (![[NSFileManager defaultManager] fileExistsAtPath:[storeURL absoluteString]]) {
    NSLog(@"Destination file does not exist. \nPath: %@", [storeURL absoluteString]);

    [[NSFileManager defaultManager] copyItemAtURL:initialURL toURL:storeURL error:&error];

    NSLog(@"Error: %@", [error description]);
}