You selector method is wrong.
CCMenuItem *starMenuItem = [CCMenuItemImage
itemFromNormalImage:@"player.png" selectedImage:@"player.png"
target:self selector:@selector(starGame:)];
Instead of
CCMenuItem *starMenuItem = [CCMenuItemImage
itemFromNormalImage:@"player.png" selectedImage:@"player.png"
target:self selector:@selector(startGame:)];