关于ionic serve 浏览器不能正常启动的问题

Question

D:\work\ionic>demo>ionic serve{ Error: Cannot find module '@ionic/app-scripts'    at Function.Module._resolveFilename (module.js:440:15)    at Function.Module._load (module.js:388:25)    at Module.require (module.js:468:17)    at require (internal/module.js:20:19)    at Object.<anonymous> (D:\work\ionic\demo\node_modules\@ionic\cli-build-ionic-angular\dist\index.js:24986:18)    at __webpack_require__ (D:\work\ionic\demo\node_modules\@ionic\cli-build-ionic-angular\dist\index.js:20:30)    at Object.<anonymous> (D:\work\ionic\demo\node_modules\@ionic\cli-build-ionic-angular\dist\index.js:25080:28)    at next (native)    at D:\work\ionic\demo\node_modules\@ionic\cli-build-ionic-angular\dist\index.js:25053:71    at __awaiter (D:\work\ionic\demo\node_modules\@ionic\cli-build-ionic-angular\dist\index.js:25049:12) code: 'MODULE_NOT_FOUND' }只会显示以上代码 有同学遇到这种情况吗  版本是3.0.0-beta.4