[WP8] Cocos2dx 2.0 - Problem occurs when change Build Debug to Build Release ?

Hi all,
I build debug project and it work fine. But when I change to build release (ARM), problem occurs,
The first, CCSprite can not load image in Assets:

splash=CCSprite::create; => Null.

I think, some configuration when build project is wrong.
If you have same problem, please let me know.