Angular 命令'；ng构建'；

尝试使用“Angular cli”构建项目时，我遇到以下错误

D:\workspace\migration-project>ng build
ENOENT: no such file or directory, stat 'D:\workspace\migration-project\src\assets'
Error: ENOENT: no such file or directory, stat 'D:\workspace\migration-project\src\assets'
    at Error (native)
    at Object.fs.statSync (fs.js:844:18)
    at D:\workspace\migration-project\node_modules\angular-cli\plugins\glob-copy-webpack-plugin.js:16:64
    at Array.map (native)
    at GlobCopyWebpackPlugin.apply (D:\workspace\migration-project\node_modules\angular-cli\plugins\glob-copy-webpack-plugin.js:16:29)
    at Compiler.apply (D:\workspace\migration-project\node_modules\tapable\lib\Tapable.js:233:16)
    at WebpackOptionsApply.process (D:\workspace\migration-project\node_modules\webpack\lib\WebpackOptionsApply.js:59:18)
    at webpack (D:\workspace\migration-project\node_modules\webpack\lib\webpack.js:28:48)
    at Class.exports.default.Task.extend.run (D:\workspace\migration-project\node_modules\angular-cli\tasks\build-webpack.js:20:31)
    at Class.Command.extend.run (D:\workspace\migration-project\node_modules\angular-cli\commands\build.js:50:26)
    at Class. (D:\workspace\migration-project\node_modules\angular-cli\lib\models\command.js:152:17)
    at tryCatch (D:\workspace\migration-project\node_modules\rsvp\dist\lib\rsvp\-internal.js:215:12)
    at invokeCallback (D:\workspace\migration-project\node_modules\rsvp\dist\lib\rsvp\-internal.js:230:13)
    at D:\workspace\migration-project\node_modules\rsvp\dist\lib\rsvp\then.js:29:16
    at flush (D:\workspace\migration-project\node_modules\rsvp\dist\lib\rsvp\asap.js:85:5)
    at nextTickCallbackWith0Args (node.js:420:9)
    at process._tickCallback (node.js:349:13)
 

实际上，我在src中没有任何资产目录或文件。不知道它为什么要这样做

操作系统：Windows 10
网页包：2.1.0-beta.25
angular cli:1.0.0-beta.19-3（本地和全球）
@角度和角度/材质：最新版本

npm安装中没有安装

有人面临类似的问题吗？
任何线索都会非常有用

更新：问题在于angular cli。问题在将angular cli回滚到1.0.0-beta后得到解决。17
我在更新到angular cli版本1.0.0-beta.20-4后通过手动创建src/assets文件夹解决了问题

使用最新的angular cli创建新项目时：

ng new migration-project

将创建一个文件夹：

src/assets

使用名为.gitkeep的文件

我还没有研究为什么需要这个文件夹，但一切都恢复正常了