v2.1.5, cocos2dx_lua_loader prints error message for iOS

I just upgraded to version 2.1.5 and it complains

can not get file data of xxx
but the game runs correctly.

The lua script files are under “Documents\Script” folder in running time, and I added the path to lua engine by calling “addSearchPath”.
I tried to add the path to CCFileUtils, it should be working, but maybe the search path were reset somewhere in the code, the log were still there.

I noticed that in version 2.1.4, cocos2dx_lua_loader (it had another name) only set for Android platform. Is there something changed? How can I avoid the log message?