# Sometimes error when play app. "cannot remove an observer"

**URL:** https://community.thunkable.com/t/sometimes-error-when-play-app-cannot-remove-an-observer/2370730
**Category:** Questions about Thunkable X
**Tags:** help
**Created:** [April 13, 2023, 12:20pm UTC](https://community.thunkable.com/t/sometimes-error-when-play-app-cannot-remove-an-observer/2370730 "2023-04-13T12:20:22Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![sinotpeter](https://avatars.discourse-cdn.com/v4/letter/s/f4b2a3/32.png) [@sinotpeter](https://community.thunkable.com/u/sinotpeter)
#### Post date: [April 13, 2023, 12:20pm UTC](https://community.thunkable.com/t/sometimes-error-when-play-app-cannot-remove-an-observer/2370730/1 "2023-04-13T12:20:22Z")

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When i play my game i get sometimes an error: see

 ![image](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/e/a/ea5bca8f681c2538d259d23c55b52e3600e7ad97.jpeg)

. “cannot remove an observer”

What is this error?  
Thanks

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### Author: ![ioannis](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ioannis/32/146956_2.png) [@ioannis](https://community.thunkable.com/u/ioannis)
#### Post date: [April 14, 2023, 4:16pm UTC](https://community.thunkable.com/t/sometimes-error-when-play-app-cannot-remove-an-observer/2370730/2 "2023-04-14T16:16:12Z")

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@sinotpeter I found the same issue [here](https://github.com/expo/expo/issues/20855), in case it helps

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### Author: ![sinotpeter](https://avatars.discourse-cdn.com/v4/letter/s/f4b2a3/32.png) [@sinotpeter](https://community.thunkable.com/u/sinotpeter)
#### Post date: [April 14, 2023, 6:30pm UTC](https://community.thunkable.com/t/sometimes-error-when-play-app-cannot-remove-an-observer/2370730/3 "2023-04-14T18:30:21Z")

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thanks

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### Author: ![system](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/0/f/0f59f292712368bce16ff80133ae10de8a6f27e8.png) [@system](https://community.thunkable.com/u/system)
#### Post date: [July 13, 2023, 6:31pm UTC](https://community.thunkable.com/t/sometimes-error-when-play-app-cannot-remove-an-observer/2370730/4 "2023-07-13T18:31:06Z")

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