我们有一些之前项目积累的lua代码，我打算单独抽离出来做一个公共的库。
我用IDE增加了一个User Library，然后“Add External Folder”把公共库的目录加到这个User Library。在工程中在引入这个User Library，但是一直报module not found. 这是错误信息：
cocos2d: 
module ‘pinluaext.init’ not found:
no field package.preload’pinluaext.init’]
no file ‘./pinluaext/init.lua’
no file ‘/usr/local/share/luajit-2.0.3/pinluaext/init.lua’
no file ‘/usr/local/share/lua/5.1/pinluaext/init.lua’
no file ‘/usr/local/share/lua/5.1/pinluaext/init/init.lua’
no file ‘/Users/yafeng/Assembla/pincollage/branches/wallet_1-0-0-BRANCH/src/pinluaext/init.lua’
no file ‘./pinluaext/init.so’
no file ‘/usr/local/lib/lua/5.1/pinluaext/init.so’
no file ‘/usr/local/lib/lua/5.1/loadall.so’
no file ‘./pinluaext.so’
no file ‘/usr/local/lib/lua/5.1/pinluaext.so’
no file ‘/usr/local/lib/lua/5.1/loadall.so’
请问是不是我添加用户库的方式不对，或者还需要做其他什么配置？