android的sdk是放置在G:\jinshanandroid\androidsdk

cordova 的工程目录是在F:\First\workshop3下

组建的时候总是失败

F:\First\workshop3>cordova build android
Running command: F:\First\workshop3\platforms\android\cordova\build.bat
Buildfile: F:\First\workshop3\platforms\android\build.xml

BUILD FAILED
F:\First\workshop3\platforms\android\build.xml:37: Cannot find F:\First\workshop
3\platforms\android\${sdk.dir}\tools\ant\pre_setup.xml imported from F:\First\wo
rkshop3\platforms\android\build.xml

Total time: 2 seconds
Built the following apk(s):

请问各位什么原因？谢谢，ant  sdk的环境变量都已经配置好的