Unable to load TileMap (3.0alpha0-pre)

The resources path is defined as Resources as default.
If the tmx file and its image files are saved in TileMaps, the system still try to get images in Resources folder, which returns error

cocos2d::TMXTiledMap::create(“TileMaps/hexa-test.tmx”);

It is noted that there is no assert to check if texture is null or not
if the texture cannot be loaded, it will crash