Cocos2d-x配置环境问题

**** Clean-only build of configuration Default for project hello ****

python E:/hello/proj.android/build_native.py clean
系统找不到指定的路径。
The Selected NDK toolchain version was 4.8 !
Traceback (most recent call last):
File "E:/hello/proj.android/build_native.py", line 166, in
build(opts.ndk_build_param,opts.android_platform,opts.build_mode)
File "E:/hello/proj.android/build_native.py", line 153, in build
do_build(cocos_root, ndk_root, app_android_root,ndk_build_param,sdk_root,android_platform,build_mode)
File "E:/hello/proj.android/build_native.py", line 89, in do_build
raise Exception("Build dynamic library for project [ " + app_android_root + " ] fails!")
Exception: Build dynamic library for project [ E:\hello\proj.android ] fails!

**** Build Finished ****

NDK 路径定义好。写在mk文件里。