Application Crash because of NSNotification

[ajaysharmalike]

Hi, There are two issues which I am facing after doing the customisation in the app.

// Application Getting crash over here

What would be the reason for the same.

Also, how can I integrate In-app Purchase in the Store.m file, since I am using the server model for fetching the list of products and require to get the price from iTunes.

In Store.m File
What is dispatch_queue_create used for ? And what if, I just comment out this code ? Since I think, this is the reason for my app crashing.

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        DOWNLOAD_GCD_QUEUE = dispatch_queue_create("com.viggiosoft.tutorial.howtomakeamagazine", DISPATCH_QUEUE_SERIAL);            
    });

Thanks,