# \#runtime-error

**URL:** https://forum.8thwall.com/tag/runtime-error/101.md

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## [Exception when using prefab with physics collider component](https://forum.8thwall.com/t/exception-when-using-prefab-with-physics-collider-component/7401)

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**Author:** [@Xihui\_Ng](https://forum.8thwall.com/u/Xihui_Ng)\
**Replies:** 3\
**Last updated:** [July 12, 2025, 2:30am UTC](https://forum.8thwall.com/t/exception-when-using-prefab-with-physics-collider-component/7401 "2025-07-12T02:30:39Z")

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I initially thought that there was a problem with the way I spawn prefab instances. Everytime I attempt to spawn more instances of the prefab, there will be an exception that looks like this, Uncaught RuntimeError: null…

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## [Testing errors](https://forum.8thwall.com/t/testing-errors/2260)

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**Author:** [@Matthew\_Potter](https://forum.8thwall.com/u/Matthew_Potter)\
**Replies:** 4\
**Last updated:** [July 30, 2024, 9:18pm UTC](https://forum.8thwall.com/t/testing-errors/2260 "2024-07-30T21:18:33Z")

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Is there any way to test errors and error screens? We’re getting ready to launch a site for a client and there has been a few rare cases where the cameraSelectionWorldTrackingError comes up. We’re wanting to replace the …