空项目打包失败

helloworid项目直接打包失败。。。
Based on: cocos2d-x-3.10
Process Process-1:
Traceback (most recent call last):
File “C:\Users\Administrator\Documents\Cocos\CocosStudio2\Third_Party\python\lib\multiprocessing\process.py”, line 250, in _bootstrap
sys.stdin = open(os.devnull)
IOError: [Errno 2] No such file or directory: ‘nul’
Process Process-2:
Traceback (most recent call last):
File “C:\Users\Administrator\Documents\Cocos\CocosStudio2\Third_Party\python\lib\multiprocessing\process.py”, line 250, in _bootstrap
sys.stdin = open(os.devnull)
IOError: [Errno 2] No such file or directory: ‘nul’
Process Process-3:
Traceback (most recent call last):
File “C:\Users\Administrator\Documents\Cocos\CocosStudio2\Third_Party\python\lib\multiprocessing\process.py”, line 250, in _bootstrap
sys.stdin = open(os.devnull)
IOError: [Errno 2] No such file or directory: ‘nul’
Process Process-4:
Traceback (most recent call last):
File “C:\Users\Administrator\Documents\Cocos\CocosStudio2\Third_Party\python\lib\multiprocessing\process.py”, line 250, in _bootstrap
sys.stdin = open(os.devnull)
IOError: [Errno 2] No such file or directory: ‘nul’
系统找不到指定的文件。
编译模式:debug
使用 Eclipse 工程:F:\Cocos\program\NewCocosProject\proj.android
未指定 Android 目标平台版本,自动查找一个可用版本…
正在执行:’“F:\Cocos\tools\Android-SDK\tools\android” update project -t android-20 -p F:\Cocos\program\NewCocosProject\proj.android’
执行命令出错,返回值:255。
Process Process-6:
Process Process-5:
Traceback (most recent call last):
File “C:\Users\Administrator\Documents\Cocos\CocosStudio2\Third_Party\python\lib\multiprocessing\process.py”, line 250, in _bootstrap
sys.stdin = open(os.devnull)
IOError: [Errno 2] No such file or directory: ‘nul’
Traceback (most recent call last):
File “C:\Users\Administrator\Documents\Cocos\CocosStudio2\Third_Party\python\lib\multiprocessing\process.py”, line 250, in _bootstrap
sys.stdin = open(os.devnull)
IOError: [Errno 2] No such file or directory: ‘nul’

我专门在F盘根目录建了一个cocos文件夹,工具都是直接用cocos一键下载的,直接生成helloworid打包失败。。。