Of course you can't add CCSprite on UIView. CCSprite is from Cocos2d library class and UIView is UIKit class. If you want add UIView over game view then you need to access rootviewcontroller view which is root of UIWindow. Its something like this,

[appDelegate.yourRootViewController.view addSubview:yourview];

Always keep remember Cocos2d library control are part of GLView.