# "The version number of this file format is not supported."

**URL:** <https://qa.fmod.com/t/the-version-number-of-this-file-format-is-not-supported/13455>\
**Category:** FMOD Studio\
**Created:** [September 22, 2017, 9:56am UTC](https://qa.fmod.com/t/the-version-number-of-this-file-format-is-not-supported/13455 "2017-09-22T09:56:17Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![jacobalmond](https://avatars.discourse-cdn.com/v4/letter/j/d26b3c/32.png) [@jacobalmond](https://qa.fmod.com/u/jacobalmond)\
**Post date:** [September 22, 2017, 9:56am UTC](https://qa.fmod.com/t/the-version-number-of-this-file-format-is-not-supported/13455/1 "2017-09-22T09:56:17Z")

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Hi All,

I just installed version 1.10 of FMOD Studio (loving the look of the new features!), and opened my project. FMOD asked me whether I wanted to migrate the project to the new version, which I did.

Now, when I click build banks, Unreal is showing the message “The version number of this file format is not supported” for all banks. Is there some step I have missed?

I am using FMOD with Unreal 4.16.2 and Perforce. I have switched back to FMOD 1.09.08 for now (I did not save the project), but it was necessary to revert changes to all of the banks in Perforce to fix this problem, as the message continued to show in 1.09.08 afterwards.

Thanks!

Jacob

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**Author:** ![brett](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/brett/32/261_2.png) [@brett](https://qa.fmod.com/u/brett)\
**Post date:** [September 24, 2017, 10:22am UTC](https://qa.fmod.com/t/the-version-number-of-this-file-format-is-not-supported/13455/2 "2017-09-24T10:22:28Z")

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Hi,  
Did you clean/force a full rebuild of all your banks? You cannot mix compiled 1.09 and 1.10 banks.

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<div class="post-metadata">

**Author:** ![jacobalmond](https://avatars.discourse-cdn.com/v4/letter/j/d26b3c/32.png) [@jacobalmond](https://qa.fmod.com/u/jacobalmond)\
**Post date:** [September 24, 2017, 8:03pm UTC](https://qa.fmod.com/t/the-version-number-of-this-file-format-is-not-supported/13455/3 "2017-09-24T20:03:32Z")

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> [@](#):
>
> Hi,  
> Did you clean/force a full rebuild of all your banks? You cannot mix compiled 1.09 and 1.10 banks.

Thanks for your reply. When you say “clean/force a full rebuild of all your banks” do you mean selecting File \> Build, to build banks? If so, then yes, this is what I did and is what causes the error. If you mean something else, could you expound? Thanks! 🙂

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**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\
**Post date:** [September 24, 2017, 10:45pm UTC](https://qa.fmod.com/t/the-version-number-of-this-file-format-is-not-supported/13455/4 "2017-09-24T22:45:38Z")

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Did you also update the UE4 FMOD integration to 1.10.00?  
Older versions of the integration won’t work with newer Studio versions.

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**Author:** ![jacobalmond](https://avatars.discourse-cdn.com/v4/letter/j/d26b3c/32.png) [@jacobalmond](https://qa.fmod.com/u/jacobalmond)\
**Post date:** [September 25, 2017, 8:38am UTC](https://qa.fmod.com/t/the-version-number-of-this-file-format-is-not-supported/13455/5 "2017-09-25T08:38:53Z")

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> [@](#):
>
> Did you also update the UE4 FMOD integration to 1.10.00?  
> Older versions of the integration won’t work with newer Studio versions.

That’ll be it. 🙂

I am still using the Unreal 4.16 integration for 1.09.08. Knew it would be something simple - thanks!