pathForResorce doesn't work with NSMutableArray

I have a jpg picture in my "Other Sources" folder, on xcode. Nice. But I'm trying to add this image to my NSMutableArray.

[self.gallery addObject:[[NSBundle mainBundle] path开发者_如何学编程ForResource:@"001" ofType:@"jpg"]];

NSLog(@"%i", [self.gallery count]);

When I counts it, it returns 0.

What's happening?

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either self.gallery is nil or there is no image 001.jpg in your bundle