小弟最近从github上下载了一个网页的项目，但是通过yarn来启动程序时，出现了下面的错误。有没有哪位大神遇到过同样的问题，能不吝指教小弟一下，不胜感激~
TypeError: Cannot read property 'Symbol(Symbol.iterator)' of undefined
at usedChunks.reduce (D:\l\node_modules\webpack\lib\optimize\CommonsChunkPlugin.js:296:29)
at Array.reduce (native)
at CommonsChunkPlugin.getExtractableModules (D:\l\node_modules\webpack\lib\optimize\CommonsChunkPlugin.js:295:46)
at targetChunks.forEach (D:\l\node_modules\webpack\lib\optimize\CommonsChunkPlugin.js:136:38)
at Array.forEach (native)
at Compilation.compilation.plugin (D:\l\node_modules\webpack\lib\optimize\CommonsChunkPlugin.js:102:18)
at Compilation.applyPluginsBailResult1 (D:\l\node_modules\tapable\lib\Tapable.js:140:27)
at Compilation.seal (D:\l\node_modules\webpack-dev-server\node_modules\webpack\lib\Compilation.js:571:9)
at D:\l\webpack-dev-server\node_modules\webpack\lib\Compiler.js:488:16
at D:\l\node_modules\tapable\lib\Tapable.js:289:11
at _addModuleChain (D:\l\node_modules\webpack-dev-server\node_modules\webpack\lib\Compilation.js:477:11)
at processModuleDependencies.err (D:\l\node_modules\webpack-dev-server\node_modules\webpack\lib\Compilation.js:448:13)
at _combinedTickCallback (internal/process/next_tick.js:67:7)
at process._tickCallback (internal/process/next_tick.js:98:9)
error Command failed with exit code 1.
error Command failed with exit code 1.
error Command failed with exit code 1.
