# FMOD Error: 'assertion: level \>= 0.0f' failed in Build Environment Only

**URL:** <https://qa.fmod.com/t/fmod-error-assertion-level-0-0f-failed-in-build-environment-only/22242>\
**Category:** Unity\
**Created:** [October 31, 2024, 2:31am UTC](https://qa.fmod.com/t/fmod-error-assertion-level-0-0f-failed-in-build-environment-only/22242 "2024-10-31T02:31:32Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![aispk123](https://avatars.discourse-cdn.com/v4/letter/a/85e7bf/32.png) [@aispk123](https://qa.fmod.com/u/aispk123)\
**Post date:** [October 31, 2024, 2:31am UTC](https://qa.fmod.com/t/fmod-error-assertion-level-0-0f-failed-in-build-environment-only/22242/1 "2024-10-31T02:31:32Z")

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Hello FMOD team and community,

I’m encountering an error in my Unity project that only appears in the build environment. In the Unity Editor, there are no issues, but in the build (Windows platform), the following error message appears:

`[FMOD] assert : assertion: 'level >= 0.0f' failed`

Could you please explain the exact meaning of this error?

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**Author:** ![Leah\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/leah_fmod/32/3685_2.png) [@Leah\_FMOD](https://qa.fmod.com/u/Leah_FMOD)\
**Post date:** [November 7, 2024, 4:13am UTC](https://qa.fmod.com/t/fmod-error-assertion-level-0-0f-failed-in-build-environment-only/22242/2 "2024-11-07T04:13:33Z")

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This assert occurs when you attempt to set the volume of something in the Studio API with a negative value outside of its specified linear range (i.e. 0 to positive `inf`), likely [Studio::EventInstance::setVolume](https://www.fmod.com/docs/2.02/api/studio-api-eventinstance.html#studio_eventinstance_setvolume). If you don’t provide a value within the specified range, the assert should stop occurring.

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**Author:** ![aispk123](https://avatars.discourse-cdn.com/v4/letter/a/85e7bf/32.png) [@aispk123](https://qa.fmod.com/u/aispk123)\
**Post date:** [November 12, 2024, 12:58am UTC](https://qa.fmod.com/t/fmod-error-assertion-level-0-0f-failed-in-build-environment-only/22242/3 "2024-11-12T00:58:58Z")

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Thanks, Leah

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**Author:** ![Leah\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/leah_fmod/32/3685_2.png) [@Leah\_FMOD](https://qa.fmod.com/u/Leah_FMOD)\
**Post date:** [November 12, 2024, 2:50am UTC](https://qa.fmod.com/t/fmod-error-assertion-level-0-0f-failed-in-build-environment-only/22242/4 "2024-11-12T02:50:26Z")

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No problem!