Error saving data to cache directory (iPhone)

I am trying to save images using the following code: ``` - (void)writeData{ if(cacheFileName==nil) return; if(cacheDirectoryPath==nil) return; if (![[NSFileManager defaultManager] fileExistsAtPath:[self filePath]]) { NSData *imageData = UIImageJPEGRepresentation(self.image, 0.9); NSError *writeError= nil; BOOL didWrite = [imageData writeToFile:[self filePath] options:NSAtomicWrite error:&writeError]; if(writeError) NSLog([writeError localizedDescription]); if(didWrite) NSLog(@"image saved"); else NSLog(@"image not saved"); } } - (NSString *)filePath{ NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *cacheDirectory = [paths objectAtIndex:0]; NSString *filename = [cacheDirectory stringByAppendingPathComponent:cacheDirectoryPath]; filename = [filename stringByAppendingPathComponent:cacheFileName]; NSLog(filename); return filename; } ``` I get an error: ``` 2009-06-23 16:39:19.740 XXX[33454:20b] Operation could not be completed. (Cocoa error 4.) ``` I looked this up and see the error has the following meaning: ``` NSFileNoSuchFileError = 4, // Attempt to do a file system operation on a non-existent file ``` Which doesn't make sense since the file shouldn't exist. I have tried writing the png representation and using the convenience method: ``` - (BOOL)writeToFile:(NSString *)path atomically:(BOOL)flag ``` I am using similar code to save plists, and they work fine. I am not sure what the problem is. Any ideas?