iOS NSJSON Returning Null

Question

I have the following code

 hostStr = [hostStr stringByAppendingString:post];
NSData *dataURL =  [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]];    
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];    

NSError *error = nil;
NSDictionary *result = [NSJSONSerialization 
                        JSONObjectWithData:dataURL
                        options:kNilOptions 
                        error:&error];

NSArray *files = [result objectForKey:@"GV_Return"];

NSLog(@"Files: %@", files);

// For Each Key we seperate the data and add it to an object to be used.
for (NSDictionary *file in files)
{           
NSString *userNumber = [result objectForKey:@"UserNumber"];
NSLog(@"output: %@", userNumber);
}

The problem I'm having is that NSLog(@"Files: %@", files); returns what I expect

Files: (
    {
    UserNumber = 1;
}
)

However NSLog(@"output: %@", userNumber); Returns NULL

I need help figuring out why NSString *userNumber = [result objectForKey:@"UserNumber"]; does not seem to be returning "1" as it should.