NSdata writeToURL not working

NSdata writeToURL not working

i'm trying to save a NsData file into a directory. that is the code of my
method:
- (void)cacheImage:(NSData *)imageData withTitle:(NSString *)title
{
NSURL *cacheURL = (NSURL *)[[self.fileMenager
URLsForDirectory:NSCachesDirectory inDomains:NSUserDomainMask]
objectAtIndex:0]; //we take the URL of the cache Directory and comvert
the url of the cache directory into a string
NSURL *imageFolder = [cacheURL
URLByAppendingPathComponent:PHOTO_CACHE_FOLDER];
if ([self.fileMenager isWritableFileAtPath:[cacheURL path]]) { //check
if the cache directory is writable
if (![self.fileMenager createDirectoryAtURL:cacheURL
withIntermediateDirectories:NO attributes:nil error:nil]) {
//check if the directory of our image is already exist
NSURL * fileToWrite = [[imageFolder
URLByAppendingPathComponent:title isDirectory:NO]
URLByAppendingPathExtension:@"jpg"]; //take the complete url
of image
if ([imageData writeToURL:fileToWrite atomically:YES])
//atomically = safe write
{
NSArray *debug = [self.fileMenager
contentsOfDirectoryAtPath:[imageFolder path] error:nil];
for (NSURL *url in debug)
NSLog(@"url prooooo : %@",url);
}
}
}
}
that is an example of url (fileToWrite) where i try to write:
file://localhost/Users/MarcoMignano/Library/Application%20Support/iPhone%20Simulator/6.1/Applications/93B0A0AC-EC13-4050-88CA-F46FBA11001E/Library/Caches/image_cache/Mozart%201.jpg
the point is simple, the method writeToURL return NO, i can't understand
why, the url looks correct.
somebody can help my' thank you.