# Issue with app simulator

**URL:** <https://forum.magicleap.cloud/t/issue-with-app-simulator/2321>\
**Category:** App Simulator\
**Created:** [August 4, 2023, 2:50pm UTC](https://forum.magicleap.cloud/t/issue-with-app-simulator/2321 "2023-08-04T14:50:33Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ccarrieta](https://avatars.discourse-cdn.com/v4/letter/c/8797f3/32.png) [@ccarrieta](https://forum.magicleap.cloud/u/ccarrieta)\
**Post date:** [August 4, 2023, 2:50pm UTC](https://forum.magicleap.cloud/t/issue-with-app-simulator/2321/1 "2023-08-04T14:50:33Z")

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Hi my app simulator was working well yesterday.. I made no changes and now I get the following error message :

- Could not start the server
  - ZIServerStart(GetHandle(), in\_progress\_monitor) failed with ZIResult -71 (the Zero Iteration runtime is not compatible with the currently running Zero Iteration server)

Any Help Please

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**Author:** ![etucker](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.magicleap.cloud/etucker/32/842_2.png) [@etucker](https://forum.magicleap.cloud/u/etucker)\
**Post date:** [August 4, 2023, 3:17pm UTC](https://forum.magicleap.cloud/t/issue-with-app-simulator/2321/2 "2023-08-04T15:17:42Z")

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Hi @ccarrieta,

Welcome to the Magic Leap 2 Developer Forums. We are so grateful to have you here engaging with us.

Thank you for these details. This is a known issue with the new release and we are actively working on this. There will be an automatic update in the ML Hub soon.

Best,

El

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**Author:** ![etucker](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.magicleap.cloud/etucker/32/842_2.png) [@etucker](https://forum.magicleap.cloud/u/etucker)\
**Post date:** [August 4, 2023, 8:02pm UTC](https://forum.magicleap.cloud/t/issue-with-app-simulator/2321/3 "2023-08-04T20:02:17Z")

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Hi @ccarrieta,

The App Simulator issue has been fixed. You can now download the corrected version in the hub.

Best,

El

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**Author:** ![ccarrieta](https://avatars.discourse-cdn.com/v4/letter/c/8797f3/32.png) [@ccarrieta](https://forum.magicleap.cloud/u/ccarrieta)\
**Post date:** [August 4, 2023, 11:50pm UTC](https://forum.magicleap.cloud/t/issue-with-app-simulator/2321/4 "2023-08-04T23:50:21Z")

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Not sure is its working I can start the app simulator and press play in unity but nothing happens on the device or the app simulator virtual room

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**Author:** ![etucker](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.magicleap.cloud/etucker/32/842_2.png) [@etucker](https://forum.magicleap.cloud/u/etucker)\
**Post date:** [August 7, 2023, 3:04pm UTC](https://forum.magicleap.cloud/t/issue-with-app-simulator/2321/5 "2023-08-07T15:04:50Z")

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Are you receiving any new errors after the update?