我试图在Windows上安装Dart-VM，我按照这里描述的步骤操作

https://github.com/dart-lang/sdk/wiki/Building当我运行build.py命令时，如下所示：

. \ tools \ build.py --mode release --arch x64 create_sdk

我收到以下错误：

gn gen --check in out\ReleaseX64
Traceback (most recent call last):
  File "D:\ops\dart\sdk\tools\gn.py", line 436, in <module>
    sys.exit(main(sys.argv))
  File "D:\ops\dart\sdk\tools\gn.py", line 423, in main
    results = pool.map(run_command, commands, chunksize=1)
  File "C:\app\Python27\lib\multiprocessing\pool.py", line 251, in map
    return self.map_async(func, iterable, chunksize).get()
  File "C:\app\Python27\lib\multiprocessing\pool.py", line 567, in get
    raise self._value
WindowsError: [Error 2] System cannot find file。

Tried to run GN, but it failed. Try running it manually:
        $ python D:\ops\dart\sdk\tools\gn.py -m release -a x64 --os host -v
Traceback (most recent call last):
  File "D:\ops\dart\sdk\tools\build.py", line 658, in <module>
    sys.exit(Main())
  File "D:\ops\dart\sdk\tools\build.py", line 651, in Main
    mode, arch, cross_build) != 0:
  File "D:\ops\dart\sdk\tools\build.py", line 491, in BuildOneConfig
    args = BuildNinjaCommand(options, target, target_os, mode, arch)
  File "D:\ops\dart\sdk\tools\build.py", line 473, in BuildNinjaCommand
    if UseGoma(out_dir):
  File "D:\ops\dart\sdk\tools\build.py", line 431, in UseGoma
    return 'use_goma = true' in open(args_gn, 'r').read()
IOError: [Errno 2] No such file or directory: 'out\\ReleaseX64\\args.gn'

它似乎缺少\ ReleaseX64文件夹中的args.gn文件 . 但我在Dart源文件夹中找不到args.gn . 它是在建造过程中产生的吗？我是否做错步骤导致没有生成这样的文件？

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