# "Lookup failed error" but doesn't exist GUID

**URL:** <https://qa.fmod.com/t/lookup-failed-error-but-doesnt-exist-guid/24361>\
**Category:** FMOD Studio\
**Created:** [June 25, 2026, 6:50am UTC](https://qa.fmod.com/t/lookup-failed-error-but-doesnt-exist-guid/24361 "2026-06-25T06:50:48Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![woong\_abutton](https://avatars.discourse-cdn.com/v4/letter/w/ee7513/32.png) [@woong\_abutton](https://qa.fmod.com/u/woong_abutton)\
**Post date:** [June 25, 2026, 6:50am UTC](https://qa.fmod.com/t/lookup-failed-error-but-doesnt-exist-guid/24361/1 "2026-06-25T06:50:48Z")

</div>

```auto
LogFMOD: Warning: C:\buildagent2\work\c1c3f17eb167c494\studio_api\src\fmod_objectlookup.h(125) - Lookup failed for EventModel: {04161922-df35-4d06-9e05-205d8fd73524}

```

I can resolve most of the “lookup failed” errors that occur very occasionally, but sometimes the error is for an event that doesn’t exist in GUIDs.txt. In this case, what’s the problem and how should I fix it? For the error above as well, I couldn’t find a GUID named 04161922 in the GUIDs.txt

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<div class="post-metadata">

**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:** [June 26, 2026, 6:04am UTC](https://qa.fmod.com/t/lookup-failed-error-but-doesnt-exist-guid/24361/2 "2026-06-26T06:04:41Z")

</div>

A few questions:

- Does this warning occur at a specific time/after any specific actions?
- Are you receiving any other warnings or errors from FMOD?
- If you delete and completely rebuild your banks, does the issue still occur?

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<div class="post-metadata">

**Author:** ![woong\_abutton](https://avatars.discourse-cdn.com/v4/letter/w/ee7513/32.png) [@woong\_abutton](https://qa.fmod.com/u/woong_abutton)\
**Post date:** [June 26, 2026, 10:41am UTC](https://qa.fmod.com/t/lookup-failed-error-but-doesnt-exist-guid/24361/3 "2026-06-26T10:41:28Z")

</div>

For now, after rebuilding the banks as you advised, the lookup errors seem to have disappeared for the time being. I’ll need to test more, but doing a full cleaning of the Unreal FMOD uassets and then rebuilding the banks seems to have done the trick. Thanks, Leah!