Can't load .png from desktop

[GOA]

Hello,

I am having a bit of a difficulty understanding the error situation. Here is the code:

NSURL *imageURL = [NSURL URLWithString:@"/Users/GOA/Desktop/present.png"];

NSError* error = nil;


NSData* data = [[NSData alloc] init];


data = [NSData dataWithContentsOfURL:imageURL options:NSDataReadingUncached error:&error];


if (error) {
                         NSLog(@"%@", [error localizedDescription]);
                         }
               else 
                         {
                         NSLog(@"Data has loaded successfully.");
                         }
UIImage *image = [UIImage imageWithData:imageData];

The imageData remains nil.

The 'data' returns following error message:

The operation couldn’t be completed. (Cocoa error 256.)

What am I doing wrong and whats' the fix please ?

Thank you.