How to get path of image form Resource of main bundle

i have an iPhone application in which i added images directory (Group) in to Resources (group). i want to access that images which is in images. I need a path to that images so i create a code like following.

NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"myImage1" ofType:@"png" inDirectory:@"images"];
NSLog(@"%@", imagePath);

Result :

(null)

i also tried this code

NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"myImage1" ofType:@"png"];

But this code gives me (null) result.

myImage1 's path is Resources/images/myImage1.png

I don't know what is the problem. Please suggest some fixes.