# error on play
**URL:** https://qa.fmod.com/t/error-on-play/11424
**Category:** Unity
**Created:** [April 25, 2014, 5:28pm UTC](https://qa.fmod.com/t/error-on-play/11424 "2014-04-25T17:28:01Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@kahina](https://qa.fmod.com/u/kahina)
#### Post date: [April 25, 2014, 5:28pm UTC](https://qa.fmod.com/t/error-on-play/11424/1 "2014-04-25T17:28:01Z")
hi i got this problem with unity and fmod , when i play the game in unity i got some errors
FMOD Error (ERR\_HEADER\_MISMATCH): Unknown error.
UnityEngine.Debug:LogWarning(Object)
FMOD.Studio.UnityUtil:LogWarning(String) (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:53)
FMOD.Studio.UnityUtil:ERRCHECK(RESULT) (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:91)
FMOD\_StudioSystem:ERRCHECK(RESULT) (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:266)
FMOD\_StudioSystem:Init() (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:217)
FMOD\_StudioSystem:get\_instance() (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:121)
FMOD\_Listener:LoadPlugins() (at Assets/Plugins/FMOD/FMOD\_Listener.cs:165)
FMOD\_Listener:Initialize() (at Assets/Plugins/FMOD/FMOD\_Listener.cs:128)
FMOD\_Listener:OnEnable() (at Assets/Plugins/FMOD/FMOD\_Listener.cs:21)
NullReferenceException: Object reference not set to an instance of an object
FMOD\_StudioSystem.Init () (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:227)
FMOD\_StudioSystem.get\_instance () (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:121)
FMOD\_Listener.LoadPlugins () (at Assets/Plugins/FMOD/FMOD\_Listener.cs:165)
FMOD\_Listener.Initialize () (at Assets/Plugins/FMOD/FMOD\_Listener.cs:128)
FMOD\_Listener.OnEnable () (at Assets/Plugins/FMOD/FMOD\_Listener.cs:21)
NullReferenceException: Object reference not set to an instance of an object
FMOD\_StudioSystem.GetEvent (System.String path) (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:156)
SoundManager.Start () (at Assets/Scripts/SoundManager.cs:18)
NullReferenceException: Object reference not set to an instance of an object
FMOD\_Listener.Update () (at Assets/Plugins/FMOD/FMOD\_Listener.cs:159)
can anyone help me with that, its happening since i upgrade to 1.03.06
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### Author:  [@Guest1](https://qa.fmod.com/u/Guest1)
#### Post date: [April 27, 2014, 9:41pm UTC](https://qa.fmod.com/t/error-on-play/11424/2 "2014-04-27T21:41:21Z")
It’s telling you that the integration scripts do not match the binaries (DLL/bundle). This can happen if you’re using the old integration in Unity session before importing the new package. Unity will be holding a file lock on the files one you start using the integration (even using FMOD-\>About integration). If you close and reopen Unity, then import the new unity integration package that should resolve the issue.