E:\vue-project\test-vue\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:145
                        if(key.startsWith(what))
                              ^
TypeError: Cannot read property 'startsWith' of undefined
    at Storage.purge (E:\vue-project\test-vue\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:145:10)
    at Storage.purge (E:\vue-project\test-vue\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:150:9)
    at CachedInputFileSystem.purge (E:\vue-project\test-vue\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:259:20)
    at EventEmitter.watcher.once (E:\vue-project\test-vue\node_modules\webpack\lib\node\NodeWatchFileSystem.js:42:26)
    at EventEmitter.g (events.js:292:16)
    at emitTwo (events.js:106:13)
    at EventEmitter.emit (events.js:191:7)
    at EventEmitter._onTimeout (E:\vue-project\test-vue\node_modules\watchpack\lib\watchpack.js:142:7)
    at ontimeout (timers.js:386:14)
    at tryOnTimeout (timers.js:250:5)
    at Timer.listOnTimeout (timers.js:214:5)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! test-vue@1.0.0 dev: `node build/dev-server.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the test-vue@1.0.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Administrator\AppData\Roaming\npm-cache\_logs\2017-07-24T11_07_51_484Z-debug.log