# Failed to start App sim server

**URL:** <https://forum.magicleap.cloud/t/failed-to-start-app-sim-server/1649>\
**Category:** App Simulator\
**Created:** [March 29, 2023, 8:32pm UTC](https://forum.magicleap.cloud/t/failed-to-start-app-sim-server/1649 "2023-03-29T20:32:22Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![stephen](https://avatars.discourse-cdn.com/v4/letter/s/96bed5/32.png) [@stephen](https://forum.magicleap.cloud/u/stephen)\
**Post date:** [March 29, 2023, 8:32pm UTC](https://forum.magicleap.cloud/t/failed-to-start-app-sim-server/1649/1 "2023-03-29T20:32:22Z")

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Give us as much detail as possible regarding the issue you're experiencing.  
The App simulator has suddenly stopped working.  
Error message is Could not start the server  
- ZIServerStart(GetHandle(), in\_progress\_monitor) failed with ZIResult -80 (no Zero Iteration server is running)  
I have tried countless reboots, uninstalling and reninstalling the **Magic Leap Application Simulator (ZI) Runtime** and the **Magic Leap Application Simulator Hub Module** through the Hub  
I have also updated the GeForce Graphics drivers and still the same error.  
Logs Attached  
[MLHubLogs-20230329-120110-win.zip](https://forum.magicleap.cloud/uploads/short-url/lfUvFdeS016LbvDI8oROzj4tVwI.zip) (363.6 KB)

**ML2 OS version** :1.2.0-Dev2  
**MLSDK version** :1.2.0-Dev2(Secure)  
**ML Hub version** : ML Hub Version 2.0.9.202303150334  
Server: 3.5 (built Mar 8 2023), Protocol: 17  
ZIF (bundled): Version 0.0.32.20230308  
ZIF (runtime): Version 0.0.32.20230308  
**Magic Leap Application Simulator (ZI) Runtime version**:Magic Leap Application Simulator Module Version 3.5.0.202303081859

**Host OS** : (Windows/MacOS) Windows 10 Pro 64-bit (10.0, Build 19045) (19041.vb\_release.191206-1406)

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**Author:** ![kdowney](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.magicleap.cloud/kdowney/32/481_2.png) [@kdowney](https://forum.magicleap.cloud/u/kdowney)\
**Post date:** [March 29, 2023, 8:40pm UTC](https://forum.magicleap.cloud/t/failed-to-start-app-sim-server/1649/2 "2023-03-29T20:40:53Z")

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Thank you for your post @stephen and welcome to the Magic Leap 2 Forum. I'll look into the logs you attached and report back.

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**Author:** ![jonathan.valderrama](https://avatars.discourse-cdn.com/v4/letter/j/2bfe46/32.png) [@jonathan.valderrama](https://forum.magicleap.cloud/u/jonathan.valderrama)\
**Post date:** [March 29, 2023, 9:31pm UTC](https://forum.magicleap.cloud/t/failed-to-start-app-sim-server/1649/3 "2023-03-29T21:31:43Z")

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This just happened to me too. Not sure what caused it. It was working earlier today.

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**Author:** ![kdowney](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.magicleap.cloud/kdowney/32/481_2.png) [@kdowney](https://forum.magicleap.cloud/u/kdowney)\
**Post date:** [March 30, 2023, 3:56pm UTC](https://forum.magicleap.cloud/t/failed-to-start-app-sim-server/1649/4 "2023-03-30T15:56:25Z")

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@stephen There are a few lines in `MLHug_log4j.log` regarding:  
`Caused by: java.io.IOException: There is not enough space on the disk`

If you clear up `%USERPROFILE%\.config\mlvds`, that may solve the issue.

Please let me know if that unblocks your issue.