# Loading failed after ionic serve **URL:** \ **Category:** ionic-v3\ **Created:** [August 30, 2017, 10:09am UTC](https://forum.ionicframework.com/t/loading-failed-after-ionic-serve/103703 "2017-08-30T10:09:06Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![mdline](https://avatars.discourse-cdn.com/v4/letter/m/82dd89/32.png) [@mdline](https://forum.ionicframework.com/u/mdline)\ **Post date:** [August 30, 2017, 10:09am UTC](https://forum.ionicframework.com/t/loading-failed-after-ionic-serve/103703/1 "2017-08-30T10:09:06Z")
Hello, I got the error “loading failed for scipt [http://localhost:8100/build/main.js](http://localhost:8100/build/main.js)” in browser after run command ionic serve. When I click on the error it jumps to index.html to `.` When I run the command ionic build I get the error Could not resolve ‘./polyfills.ts’ from src\app\main.ts. Please help. ---
**Author:** ![Sujan12](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/sujan12/32/108395_2.png) [@Sujan12](https://forum.ionicframework.com/u/Sujan12)\ **Post date:** [August 30, 2017, 10:38am UTC](https://forum.ionicframework.com/t/loading-failed-after-ionic-serve/103703/2 "2017-08-30T10:38:52Z")
What is your `ionic info` output? Did you app work before? Does it work with a new blank app created with `ionic start blank blank`? ---
**Author:** ![mdline](https://avatars.discourse-cdn.com/v4/letter/m/82dd89/32.png) [@mdline](https://forum.ionicframework.com/u/mdline)\ **Post date:** [August 30, 2017, 11:21am UTC](https://forum.ionicframework.com/t/loading-failed-after-ionic-serve/103703/3 "2017-08-30T11:21:24Z")
cli packages ``` @ionic/cli-utils : 1.9.2 ionic (Ionic CLI) : 3.9.2 ``` local packages: ``` @ionic/app-scripts : 2.1.4 Ionic Framework : ionic-angular 3.6.0 ``` System: ``` Node : v6.10.1 npm : 4.2.0 OS : Windows 7 ``` The app works before my update, I updated the ionic and angular versions. ---
**Author:** ![Sujan12](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/sujan12/32/108395_2.png) [@Sujan12](https://forum.ionicframework.com/u/Sujan12)\ **Post date:** [August 30, 2017, 11:27am UTC](https://forum.ionicframework.com/t/loading-failed-after-ionic-serve/103703/4 "2017-08-30T11:27:46Z")
Show us your new `package.json` then please. Also run `ionic serve --verbose` and post the whole output. ---
**Author:** ![mdline](https://avatars.discourse-cdn.com/v4/letter/m/82dd89/32.png) [@mdline](https://forum.ionicframework.com/u/mdline)\ **Post date:** [August 30, 2017, 11:53am UTC](https://forum.ionicframework.com/t/loading-failed-after-ionic-serve/103703/5 "2017-08-30T11:53:36Z")
Output from ionic serve --verbose ```auto C:\XXX>ionic serve --verbose [DEBUG] CLI flags: { interactive: true, confirm: false } [DEBUG] { cwd: 'C:\\XXX', local: false, binPath: 'C:\\Users\\XXX\\AppData\\Roaming\\npm\\node_modules\\ionic\\bin\\ionic', libPath: 'C:\\Users\\XXX\\AppData\\Roaming\\npm\\node_modules\\ionic\\dist\\index.js' } [DEBUG] Daemon found (pid: 11000) [INFO] Starting app-scripts server: --address 0.0.0.0 --port 8100 --livereload-port 35729 - Ctrl+C to cancel [13:45:43] watch started ... [13:45:43] build dev started ... [13:45:43] clean started ... [13:45:43] clean finished in less than 1 ms [13:45:43] copy started ... [13:45:43] transpile started ... [13:45:46] transpile finished in 3.76 s [13:45:46] preprocess started ... [13:45:46] deeplinks started ... [13:45:47] deeplinks finished in 78 ms [13:45:47] preprocess finished in 94 ms [13:45:47] rollup started ... [13:45:47] copy finished in 3.99 s [13:45:47] dev server running: http://localhost:8100/ [INFO] Development server running Local: http://localhost:8100 [13:45:47] watch ready in 4.24 s ``` package.json ```auto { "name": "MyApp", "config": { "ionic_rollup": "src/config/rollup.config.js" }, "scripts": { "build": "ionic-app-scripts build", "watch": "ionic-app-scripts watch", "serve:before": "watch", "emulate:before": "build", "deploy:before": "build", "build:before": "build", "run:before": "build" }, "dependencies": { "@angular/common": "^4.3.6", "@angular/compiler": "^4.3.6", "@angular/compiler-cli": "^4.3.6", "@angular/core": "^4.3.6", "@angular/forms": "^4.3.6", "@angular/http": "^4.3.6", "@angular/platform-browser": "^4.3.6", "@angular/platform-browser-dynamic": "^4.3.6", "@angular/platform-server": "^4.3.6", "@ionic/storage": "^2.0.1", "@types/lodash": "^4.14.42", "angular2-cookie": "^1.2.5", "d3-ng2-service": "^1.5.2", "ionic-angular": "^3.6.0", "ionic-native": "^2.4.0", "ionicons": "^3.0.0", "lodash": "^4.17.2", "ng2-translate": "^5.0.0", "rxjs": "^5.0.0-beta.12", "zone.js": "^0.8.17" }, "devDependencies": { "@ionic/app-scripts": "^2.1.4", "rollup-plugin-replace": "^1.1.1", "sw-toolbox": "^3.4.0", "typescript": "2.3.4" }, "description": "To see deep in the sea", "cordovaPlugins": [ "cordova-plugin-device", "cordova-plugin-console", "cordova-plugin-whitelist", "cordova-plugin-splashscreen", "cordova-plugin-statusbar", "ionic-plugin-keyboard" ], "cordovaPlatforms": [] } ``` ---
**Author:** ![Sujan12](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/sujan12/32/108395_2.png) [@Sujan12](https://forum.ionicframework.com/u/Sujan12)\ **Post date:** [August 30, 2017, 12:16pm UTC](https://forum.ionicframework.com/t/loading-failed-after-ionic-serve/103703/6 "2017-08-30T12:16:12Z")
Ionic doesn’t support Angular 4.3.x yet. See here for the most recent supported versions of everything: > You can also create a new project with `ionic start blank blank` and compare that to your project. ---
**Author:** ![mdline](https://avatars.discourse-cdn.com/v4/letter/m/82dd89/32.png) [@mdline](https://forum.ionicframework.com/u/mdline)\ **Post date:** [August 30, 2017, 12:39pm UTC](https://forum.ionicframework.com/t/loading-failed-after-ionic-serve/103703/7 "2017-08-30T12:39:27Z")
I adapt the versions. I still got the error The ressourcce “[http://localhost:8100/build/main.css](http://localhost:8100/build/main.css)” is blocked due to MIME-Typ-Conflict(X-Content-Type-Options: nosniff). The main.js, main.css is still not not created.