# Ionic app wont load in IOS simulator (The App Server is not running) **URL:** \ **Category:** Ionic Framework\ **Created:** [December 20, 2018, 8:23pm UTC](https://forum.ionicframework.com/t/ionic-app-wont-load-in-ios-simulator-the-app-server-is-not-running/150963 "2018-12-20T20:23:45Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![owna](https://avatars.discourse-cdn.com/v4/letter/o/a698b9/32.png) [@owna](https://forum.ionicframework.com/u/owna)\ **Post date:** [December 20, 2018, 8:23pm UTC](https://forum.ionicframework.com/t/ionic-app-wont-load-in-ios-simulator-the-app-server-is-not-running/150963/1 "2018-12-20T20:23:45Z")
Hi Guys, I am currently working on an Ionic 3 project, this project builds and works fine on IOS devices and Android Device, however when I use any IOS simulator using xCode or using the Ionic emulate command, I get the error below. I have tried to run prod builds, removed IOS and added again, I have enabled COREs on my server etc, and search the net but nothing seems to come up! ![49](https://global.discourse-cdn.com/ionicframework/original/3X/3/0/304650302a25e62a35d13f850db482a29d4ce5f7.png) * * * Ionic: ionic (Ionic CLI) : 4.2.1 (/usr/local/lib/node\_modules/ionic) Ionic Framework : ionic-angular 3.9.2 @ionic/app-scripts : 3.2.1 Cordova: cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1) Cordova Platforms : android 7.1.4, browser 5.0.4, ios 4.5.5 Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 2.2.1, (and 8 other plugins) System: Android SDK Tools : 26.1.1 (/Users/billy/Library/Android/sdk) ios-deploy : 2.0.0 NodeJS : v8.9.1 (/usr/local/bin/node) npm : 6.4.1 OS : macOS Xcode : Xcode 10.1 Build version 10B61 ---
**Author:** ![nirman99](https://avatars.discourse-cdn.com/v4/letter/n/f19dbf/32.png) [@nirman99](https://forum.ionicframework.com/u/nirman99)\ **Post date:** [December 21, 2018, 5:05am UTC](https://forum.ionicframework.com/t/ionic-app-wont-load-in-ios-simulator-the-app-server-is-not-running/150963/2 "2018-12-21T05:05:12Z")
Something similar happed to me as well. That is when I ran the app on the browser and emulator at the same time using the same port number. Maybe it’s unrelated, I don’t know. ---
**Author:** ![owna](https://avatars.discourse-cdn.com/v4/letter/o/a698b9/32.png) [@owna](https://forum.ionicframework.com/u/owna)\ **Post date:** [December 21, 2018, 10:31am UTC](https://forum.ionicframework.com/t/ionic-app-wont-load-in-ios-simulator-the-app-server-is-not-running/150963/3 "2018-12-21T10:31:02Z")
Hi, thank you for your reply, I have tried this also, stopped the ionic serve, and then ran the emulator, however same issue, I will test this further by stopping docker and seeing if that helps ---
**Author:** ![owna](https://avatars.discourse-cdn.com/v4/letter/o/a698b9/32.png) [@owna](https://forum.ionicframework.com/u/owna)\ **Post date:** [December 21, 2018, 11:04am UTC](https://forum.ionicframework.com/t/ionic-app-wont-load-in-ios-simulator-the-app-server-is-not-running/150963/4 "2018-12-21T11:04:57Z")
Looks like it was my Docker that was causing the issue, I stopped all my docker instances and that fixed the issue, thank you ---
**Author:** ![mhartington](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/mhartington/32/137757_2.png) [@mhartington](https://forum.ionicframework.com/u/mhartington)\ **Post date:** [July 19, 2021, 9:03pm UTC](https://forum.ionicframework.com/t/ionic-app-wont-load-in-ios-simulator-the-app-server-is-not-running/150963/5 "2021-07-19T21:03:27Z")