Can anyone find the error in this POST NSMutableURLRequest to a PHP script?

PHP SCRIPT:
 
 
mb_internal_encoding("UTF-8");
        
        if(isset($_POST['format']) && isset($_POST['category']) && isset($_POST['title']) && isset($_POST['description']) && isset($_FILES['photo']) {
        	save($_POST['category'], $_POST['title'], $_POST['description'], $_FILES['photo']); 
        } else {
        	echo "There was an error, a field does not exist, please try again!<br />";
        	echo "format = " . $_POST['format'] . "<br />";
        	echo "category = " . $_POST['category'] . "<br />";
        	echo "title = " . $_POST['title'] . "<br />";
        	echo "description = " . $_POST['description'] . "<br />";
        	echo "photo =" . $_FILES['photo'] . ;
        }
    ...
    ...
 
 
OBJ-C Client code:
 
 
 //creating the url request:
    	NSURL *cgiUrl = [NSURL URLWithString:@"http://www.hhh.com/uploading.php"];
    	NSMutableURLRequest *postRequest = [NSMutableURLRequest requestWithURL:cgiUrl];
    	
    	//adding header information:
    	[postRequest setHTTPMethod:@"POST"];
    	
    	NSString *stringBoundary = [NSString stringWithString:@"0xKhTmLbOuNdArY"];
    	NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",stringBoundary];
    	[postRequest addValue:contentType forHTTPHeaderField: @"Content-Type"];
    	
    	
    	//setting up the body:
    	NSMutableData *postBody = [NSMutableData data];
    	[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"category\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithString:@"iPhone"] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"format\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithString:@"jpg"] dataUsingEncoding:NSUTF8StringEncoding]];
 
// [CORRECTED] It was like this
//   	[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] //dataUsingEncoding:NSUTF8StringEncoding]];
 
//NOW
[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
 
    	[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"title\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithString:self.theTitle] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"description\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithString:self.theCaption] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"photo\"; filename=\"%@.jpg\"\r\n", self.theTitle] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    	[postBody appendData:[NSData dataWithData:UIImageJPEGRepresentation(resizedImage(self.myPhoto, CGRectMake(0, 0, 600, 800)), 0.5)]];
    	[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
 
    	[postRequest setHTTPBody:postBody];
    	
    	NSError *theError;
    	NSData *returnData = [ NSURLConnection sendSynchronousRequest: postRequest returningResponse: nil error:&theError ];
    	NSString *returnDataString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    	
    	NSLog(@"[DEBUG]... response from request: %@", returnDataString);

                                  

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