CCEditBox Error

Hi I want to use CCEditBox and I added USING_NS_CC_EXT; and using namespace cocos2d::extension;.
But I am getting following error.

jni/…/…/Classes/LoginLayer.cpp:92:2: error: ‘CCEditbox’ was not declared in this scope
jni/…/…/Classes/LoginLayer.cpp:92:13: error: ‘m_pEditName’ was not declared in this scope
jni/…/…/Classes/LoginLayer.cpp:92:45: error: ‘editBoxSize’ was not declared in this scope

Regard.

#include “cocos-ext.h”
using namespace cocos2d::extension;

It runs.

Really, cocos2d needs a better documentation.