# Event Reference Not Found in build

**URL:** <https://qa.fmod.com/t/event-reference-not-found-in-build/21903>\
**Category:** Unity\
**Created:** [July 20, 2024, 8:22am UTC](https://qa.fmod.com/t/event-reference-not-found-in-build/21903 "2024-07-20T08:22:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Wilhelm\_LikeAStar](https://avatars.discourse-cdn.com/v4/letter/w/e47774/32.png) [@Wilhelm\_LikeAStar](https://qa.fmod.com/u/Wilhelm_LikeAStar)\
**Post date:** [July 20, 2024, 8:22am UTC](https://qa.fmod.com/t/event-reference-not-found-in-build/21903/1 "2024-07-20T08:22:19Z")

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![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/d/d282d692004e0ff6437f689bb4db01c8840f23af.png)  
 ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/0/01b78fd7b05a6a2f11b4c345ab8efff462ae2642.png)  
 ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/f/f8bac1cbe909f15dab37a995722c204479d0def0.png)

I am building a game for WebGL. Trying to play an event via Studio Event Emitter in Awake() but it says “Event Reference not found in 0x000”. This happens once in the whole game.

- All Events are assigned to banks
- Settings are correct
- Deleted streaming assets and build folder of the project and re-build but still not works

Investigation Path:

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/e/eb43edc292f856263b2d85125ef8f4b0d2c13f91.png)  
I believe WebGL blocking the audio. But how will i solve this? I need this to get played.

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/0/09473b147500a4fda568ed79b4111a1e50840418.png)  
[https://fmod.com/docs/2.02/api/platforms-html5.html#user-interaction-requirement](https://fmod.com/docs/2.02/api/platforms-html5.html#user-interaction-requirement)  
Hm so it means i need a button in order to let game start with a sound.

No no no. Even i put a button to let player play, wont work. Player must touch the screen while game is loading or loaded in order to get starting sound. This is because audio engine is inside of the engine. Not the page.

But still, even the engine gets initialized, the eventnullreferenceexception is not going away.

This thing happens only once. If i call EventEmitter.Play() again, it plays. I dont know how i solve

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<div class="post-metadata">

**Author:** ![Wilhelm\_LikeAStar](https://avatars.discourse-cdn.com/v4/letter/w/e47774/32.png) [@Wilhelm\_LikeAStar](https://qa.fmod.com/u/Wilhelm_LikeAStar)\
**Post date:** [July 23, 2024, 4:58pm UTC](https://qa.fmod.com/t/event-reference-not-found-in-build/21903/2 "2024-07-23T16:58:18Z")

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I believe this is the fix [[Unity WebGL + FMOD 2.02.05] Certain events / GUIDs are missing, but only in WebGL builds?](https://qa.fmod.com/t/unity-webgl-fmod-2-02-05-certain-events-guids-are-missing-but-only-in-webgl-builds/18316)