# Can't change the 'Play Event' parameter on the Studio Event Emitter in Unity

**URL:** https://qa.fmod.com/t/cant-change-the-play-event-parameter-on-the-studio-event-emitter-in-unity/12739
**Category:** Unity
**Created:** [October 10, 2016, 4:26am UTC](https://qa.fmod.com/t/cant-change-the-play-event-parameter-on-the-studio-event-emitter-in-unity/12739 "2016-10-10T04:26:32Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![pekena.larva](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/pekena.larva/32/134_2.png) [@pekena.larva](https://qa.fmod.com/u/pekena.larva)
#### Post date: [October 10, 2016, 4:26am UTC](https://qa.fmod.com/t/cant-change-the-play-event-parameter-on-the-studio-event-emitter-in-unity/12739/1 "2016-10-10T04:26:32Z")

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I’m trying to link an event to a Game object in Unity 5.4. I’m adding the Studio Event Emitter component, but I can’t change neither the ‘Play Event’ or the ‘Stop Event’. Both are set in ‘None’ and every time I try to change the parameter I have this “NullReferenceException” error popping up on the console. I’m not a programmer so I really don’t know how to fix that. Please help ☹

Update: I’ve read in another thread how to set the Studio Listener on the Main Camera first could solve this problem. I’ve try it, but there’s no change.

![Console message on Unity](https://s22.postimg.org/m0syxkfpd/Null_Reference_Exception.png)

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<div class="post-metadata">

### Author: ![pekena.larva](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/pekena.larva/32/134_2.png) [@pekena.larva](https://qa.fmod.com/u/pekena.larva)
#### Post date: [October 10, 2016, 4:53am UTC](https://qa.fmod.com/t/cant-change-the-play-event-parameter-on-the-studio-event-emitter-in-unity/12739/2 "2016-10-10T04:53:58Z")

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Ok people, it was a noob problem. First you have to select an event on the ‘Event’ box. THEN you choose how to play and stop the event 😃