# FMOD Assertion mNumSubSounds' failed (Unity Player)

**URL:** https://qa.fmod.com/t/fmod-assertion-mnumsubsounds-failed-unity-player/20390
**Category:** Unity
**Tags:** unity
**Created:** [July 6, 2023, 10:22am UTC](https://qa.fmod.com/t/fmod-assertion-mnumsubsounds-failed-unity-player/20390 "2023-07-06T10:22:07Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![Connor\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/connor_fmod/32/3685_2.png) [@Connor\_FMOD](https://qa.fmod.com/u/Connor_FMOD)
#### Post date: [July 10, 2023, 1:41am UTC](https://qa.fmod.com/t/fmod-assertion-mnumsubsounds-failed-unity-player/20390/4 "2023-07-10T01:41:29Z")

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Hi,

I will link this solution: [Programmer Sounds length is always 0 - #2 by aishi](https://qa.fmod.com/t/programmer-sounds-length-is-always-0/16955/2) which will allow you to check the length of the audio file.

Are you still experiencing the assertion issue?

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_[View the full topic](https://qa.fmod.com/t/fmod-assertion-mnumsubsounds-failed-unity-player/20390)._