NSURLConnection and initializing data object - objective-c

Question

I have an iOS app that pulls JSON from a remote PHP file and displays that data in a table. When I use my database/JSON file, a piece of code won't run. However, when I use a tutorial's database (http://codewithchris.com/iphone-app-connect-to-mysql-database/) it works fine. I have used the exact code in the tutorial, the JSON looks the exact same, and the PHP works fine. How can I fix this?
Objective-C
#import "HomeModel.h"
#import "Location.h"
#interface HomeModel()
{
NSMutableData *_downloadedData;
}
#end
#implementation HomeModel
- (void)downloadItems
{
// Download the json file
NSURL *jsonFileUrl = [NSURL URLWithString:#"192.168.0.4/service.php"];
NSLog(#"Donwload the JSON file");
// Create the request
NSURLRequest *urlRequest = [[NSURLRequest alloc] initWithURL:jsonFileUrl];
NSLog(#"Create the request");
// Create the NSURLConnection
[NSURLConnection connectionWithRequest:urlRequest delegate:self];
NSLog(#"Create the NSURLConnection");
}
#pragma mark NSURLConnectionDataProtocol Methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(#"Inititalize the data object");
// Initialize the data object
_downloadedData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the newly downloaded data
[_downloadedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// Create an array to store the locations
NSMutableArray *_locations = [[NSMutableArray alloc] init];
// Parse the JSON that came in
NSError *error;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_downloadedData options:NSJSONReadingAllowFragments error:&error];
// Loop through Json objects, create question objects and add them to our questions array
for (int i = 0; i < jsonArray.count; i++)
{
NSDictionary *jsonElement = jsonArray[i];
// Create a new location object and set its props to JsonElement properties
Location *newLocation = [[Location alloc] init];
newLocation.name = jsonElement[#"Name"];
newLocation.address = jsonElement[#"Address"];
newLocation.latitude = jsonElement[#"Latitude"];
newLocation.longitude = jsonElement[#"Longitude"];
// Add this question to the locations array
[_locations addObject:newLocation];
}
// Ready to notify delegate that data is ready and pass back items
if (self.delegate)
{
[self.delegate itemsDownloaded:_locations];
}
}
#end
EDIT: After further analysis, everything before - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response works. When this piece of code comes next, nothing happens.
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