warning: Attempting to create USE_BLOCK_IN_FRAME variable with block that isn't in the frame

What does mean? I get this error when trying to iterate through a file in Cocoa obj-c.

I can't find any information on the web.

Would appreciate some help. Thanks.

EDIT

I've been following this tutorial (link) to preload Core Data. I've tried creating a Cococa application and have also tried doing this from within my iPhone app. I think all my setup code for Core Data is fine. Whenever this method is called I get EXEC BAD ACCESS.

- (void)loadInitialData
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    // name ZSTREET_1   ZSTREET_2   ZCITY   ZZIP    ZURL    ZTEL    latitude    longitude

    NSString *path = [[NSBundle mainBundle] pathForResource:@"placesdata" ofType:@"txt"];

    NSString *fileString = [NSString stringWithContentsOfFile:path]; // reads file into memory as an NSString
    NSArray *lines = [fileString componentsSeparatedByString:@"\r"]; // each line, adjust character for line endings
    NSManagedObjectContext *context = [self managedObjectContext];
    for (NSString *line in lines)

    {   
        NSLog(line);

        NSString* string = [[NSString alloc] initWithUTF8String:line];
        NSArray *parts = [string componentsSeparatedByString:@"\t"];
        // value mapping
        NSString *name = [parts objectAtIndex:0];
        NSString *street_1 = [parts objectAtIndex:1];
        NSString *street_2 = [parts objectAtIndex:2];
        NSString *city = [parts objectAtIndex:3];
        NSString *zip = [parts objectAtIndex:4];
        NSString *url = [parts objectAtIndex:5];

        NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
        [f setNumberStyle:NSNumberFormatterDecimalStyle];

        NSNumber *latitude = [f numberFromString:[parts objectAtIndex:6]];
        NSNumber *longitude = [f numberFromString:[parts objectAtIndex:7]];
        [f release];
        // splitting the parts to create the objects

        Place *place = (Place *)[NSEntityDescription insertNewObjectForEntityForName:@"Place" inManagedObjectContext:context];
        Address *address = (Address *)[NSEntityDescription insertNewObjectForEntityForName:@"Address" inManagedObjectContext:context];
        Location *location = (Location *)[NSEntityDescription insertNewObjectForEntityForName:@"Location" inManagedObjectContext:context];

        // set attributes
        [place setValue:name forKey:@"name"];
        [address setValue:street_1 forKey:@"street_1"];
        [address setValue:street_2 forKey:@"street_2"];
        [address setValue:city forKey:@"city"];
        [address setValue:zip forKey:"@zip"];
        [address setValue:url forKey:@"url"];
        [location setValue:latitude forKey:@"latitude"];
        [location setValue:longitude forKey:@"longitude"];

        // link the objects together
        [place setValue:address forKey:@"address"];
        [place setValue:location forKeyPath:@"address.location"];

        [string release];
    }
    NSLog(@"Done initial load");
    NSError *error; 
    if (![context save:&error]) {
        NSLog(@"Error saving: %@", error);
    }
    [context release];
    [pool drain];


}