# "Invalid Delays" error in UE 5.6

**URL:** <https://qa.fmod.com/t/invalid-delays-error-in-ue-5-6/23775>\
**Category:** FMOD Studio\
**Created:** [December 8, 2025, 3:02pm UTC](https://qa.fmod.com/t/invalid-delays-error-in-ue-5-6/23775 "2025-12-08T15:02:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![NSignat](https://avatars.discourse-cdn.com/v4/letter/n/c2a13f/32.png) [@NSignat](https://qa.fmod.com/u/NSignat)\
**Post date:** [December 8, 2025, 3:02pm UTC](https://qa.fmod.com/t/invalid-delays-error-in-ue-5-6/23775/1 "2025-12-08T15:02:10Z")

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Hi,

We’re using the FMOD plugin into Unreal 5.6 and as we are playing one same event and updating its parameters there’s a case where we’ve got errors I’ve never seen. Here are a few of them :

LogFMOD: Warning: C:\buildagent2\work\c1c3f17eb167c494\studio\_api\src\fmod\_playback\_instrument.cpp(1330) - Loading delay exceeded. Instrument {e794e194-ad05-4776-9045-22dd97299f9e} started 23.22ms later than expected, sound may play at incorrect time. SCHEDULE\_DELAY: 185.76ms.  
LogFMOD: Warning: C:\buildagent2\work\c1c3f17eb167c494\studio\_api\src\fmod\_playback\_instrument.cpp(1330) - Loading delay exceeded. Instrument {e794e194-ad05-4776-9045-22dd97299f9e} started 23.22ms later than expected, sound may play at incorrect time. SCHEDULE\_DELAY: 185.76ms.  
LogFMOD: Warning: C:\buildagent2\work\c1c3f17eb167c494\studio\_api\src\fmod\_playback\_instrument.cpp(1330) - Loading delay exceeded. Instrument {e794e194-ad05-4776-9045-22dd97299f9e} started 23.22ms later than expected, sound may play at incorrect time. SCHEDULE\_DELAY: 185.76ms.

etc … etc …

What would be the cause of this ?

Many thanks in advance,

Nicolas Signat

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<div class="post-metadata">

**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\
**Post date:** [December 15, 2025, 10:09pm UTC](https://qa.fmod.com/t/invalid-delays-error-in-ue-5-6/23775/2 "2025-12-15T22:09:26Z")

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These warnings are telling you that the there was a delay between you calling `Start` on an Event Instance and the audio actually starting, due to the audio assets taking time to load.

This can happen if you do not load the sample data ahead of time, see [sample data loading](https://www.fmod.com/docs/2.03/api/studio-guide.html#sample-data-loading).