# DllNotFoundException: fmod
**URL:** https://qa.fmod.com/t/dllnotfoundexception-fmod/11888
**Category:** Unity
**Created:** [April 16, 2015, 11:40pm UTC](https://qa.fmod.com/t/dllnotfoundexception-fmod/11888 "2015-04-16T23:40:46Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@mightypants](https://qa.fmod.com/u/mightypants)
#### Post date: [April 16, 2015, 11:40pm UTC](https://qa.fmod.com/t/dllnotfoundexception-fmod/11888/1 "2015-04-16T23:40:46Z")
I’m getting the following error when I try to run a project un Unity using the FMOD plugin. However, this only happens when working with a Unity project I downloaded–I’ve got a couple tutorial projects, including one from the Unity site itself. I am able to use FMOD successfully on a project I created myself.
I’ve tried using the newest FMOD plugin package, as well as the older one that I imported when I started my still functional project, a few months ago (fmodstudio10508). Any ideas what’s going wrong?
Also, can someone confirm whether or not FMOD should work with the free version of Unity? I saw another thread about license errors and followed the instructions to eliminate them, but I get an error message when I got to About Integration saying I need Unity 4 pro or Unity 5. Any help would be much appreciated.
I’m on Mac OSX 10.8.5, Unity 4.6.
DllNotFoundException: fmod
FMOD.Memory.GetStats (System.Int32& currentalloced, System.Int32& maxalloced, Boolean blocking) (at Assets/Plugins/FMOD/Wrapper/fmod.cs:1617)
FMOD.Memory.GetStats (System.Int32& currentalloced, System.Int32& maxalloced) (at Assets/Plugins/FMOD/Wrapper/fmod.cs:1612)
FMOD.Studio.UnityUtil.ForceLoadLowLevelBinary () (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:105)
FMOD\_StudioSystem.get\_instance () (at Assets/Plugins/FMOD/FMOD\_StudioSystem.cs:146)
FMOD\_Listener.LoadPlugins () (at Assets/Plugins/FMOD/FMOD\_Listener.cs:219)
FMOD\_Listener.Initialize () (at Assets/Plugins/FMOD/FMOD\_Listener.cs:162)
FMOD\_Listener.OnEnable () (at Assets/Plugins/FMOD/FMOD\_Listener.cs:23)
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### Author:  [@nick1](https://qa.fmod.com/u/nick1)
#### Post date: [April 17, 2015, 2:32am UTC](https://qa.fmod.com/t/dllnotfoundexception-fmod/11888/2 "2015-04-17T02:32:18Z")
1.06.00 and onwards no longer work with Unity 4 Free. It required Unity 4 Pro, or any version of Unity 5.
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### Author:  [@mightypants](https://qa.fmod.com/u/mightypants)
#### Post date: [April 17, 2015, 11:06pm UTC](https://qa.fmod.com/t/dllnotfoundexception-fmod/11888/3 "2015-04-17T23:06:17Z")
> [@](#):
>
> 1.06.00 and onwards no longer work with Unity 4 Free. It required Unity 4 Pro, or any version of Unity 5.
Thanks for the confirmation.
Also, I’ve found that if I import the FMOD package into a Unity project and setup the FMOD\_Listener before importing the assets of the tutorial project, everything works fine. If I do it the other way around I get the error. No idea why, but for now the issue is resolved.
I’ll likely upgrade to Unity 5 in the semi-near future.