NSFetchedResultController won't show data in IOS 5 - objective-c

Question

I am new to IOS development. At the moment I'm building an iPad app, what gets data back from the webservice, saves it in a core database and shows it in a tableview using NSFetchedResultController.
What is the problem. In IOS6 it al works like a charm, in IOS 5.0 it saves the data but not showing it in the tableview. It gives the following error.
CoreData: error: Serious application error. An exception was caught from the delegate of NSFetchedResultsController during a call to -controllerDidChangeContent:. The NIB data is invalid. with userInfo (null)
And when I test in IOS 5.1 it does not do anything. It does not shows data in a tableview and data is not being stored in core database.
Here is what I do. In my view did appear I check if there is a document I can use.
if (!self.genkDatabase) { // we'll create a default database if none is set
NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
url = [url URLByAppendingPathComponent:#"Default appGenk Database"];
self.genkDatabase = [[UIManagedDocument alloc] initWithFileURL:url]; // setter will create this for us on disk
}
Then it goes to my setter. And next in usedocument gonna check in which state my document is.
- (void)setGenkDatabase:(UIManagedDocument *)genkDatabase
{
if (_genkDatabase != genkDatabase) {
_genkDatabase = genkDatabase;
[self useDocument];
}
NSLog(#"Comes in the setdatabase methode.");
}
- (void)useDocument
{
NSLog(#"Comses in the use document");
if (![[NSFileManager defaultManager] fileExistsAtPath:[self.genkDatabase.fileURL path]]) {
// does not exist on disk, so create it
[self.genkDatabase saveToURL:self.genkDatabase.fileURL forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success) {
NSLog(#"create");
[self setupFetchedResultsController];
NSLog(#"create 2");
[self fetchNewsIntoDocument:self.genkDatabase];
NSLog(#"create 3");
}];
} else if (self.genkDatabase.documentState == UIDocumentStateClosed) {
NSLog(#"closed news");
// exists on disk, but we need to open it
[self.genkDatabase openWithCompletionHandler:^(BOOL success) {
[self setupFetchedResultsController];
}];
} else if (self.genkDatabase.documentState == UIDocumentStateNormal) {
NSLog(#"normal");
// already open and ready to use
[self setupFetchedResultsController];
}
}
Finally I fetch my data in my document using the following function.
- (void)fetchNewsIntoDocument:(UIManagedDocument *)document
{
dispatch_queue_t fetchNews = dispatch_queue_create("news fetcher", NULL);
dispatch_async(fetchNews, ^{
NSArray *news = [GenkData getNews];
[document.managedObjectContext performBlock:^{
int newsId = 0;
for (NSDictionary *genkInfo in news) {
newsId++;
[News newsWithGenkInfo:genkInfo inManagedObjectContext:document.managedObjectContext withNewsId:newsId];
NSLog(#"news inserted");
}
[document saveToURL:document.fileURL forSaveOperation:UIDocumentSaveForOverwriting completionHandler:NULL];
}];
});
dispatch_release(fetchNews);
}
For the problem in IOS 5.0 is this my NSFetchResultController method.
- (void)setupFetchedResultsController // attaches an NSFetchRequest to this UITableViewController
{
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:#"News"];
request.sortDescriptors = [NSArray arrayWithObjects:[NSSortDescriptor sortDescriptorWithKey:#"date" ascending:YES],nil];
self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:request
managedObjectContext:self.genkDatabase.managedObjectContext
sectionNameKeyPath:nil
cacheName:nil];
}
I am doing this like the example from Paul Hegarty in stanford university. You can find the example Photomania over here.
Hope anyone can help me!
Kind regards