# FMOD Version Mismatch
**URL:** https://qa.fmod.com/t/fmod-version-mismatch/18431
**Category:** FMOD Engine
**Tags:** cpp
**Created:** [February 23, 2022, 2:29pm UTC](https://qa.fmod.com/t/fmod-version-mismatch/18431 "2022-02-23T14:29:28Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@makkenr95](https://qa.fmod.com/u/makkenr95)
#### Post date: [February 23, 2022, 2:29pm UTC](https://qa.fmod.com/t/fmod-version-mismatch/18431/1 "2022-02-23T14:29:28Z")
Hey.
We have upgraded from FMOD 2.01 to 2.02 and are having some version mismatch problems.
I switched out all the Library files and include files and rebuilt the project but FMOD still gives me a Version mismatch error message.
Ive taken all the files from core lib and inc as well as studio lib and inc from 2.02.05 api directory.
Fmod version exported banks come from is 2.02.05.
The error message i get is :
_There is a version mismatch between the FMOD header and either the FMOD Studio library or the FMOD Core library._
Any help is appreciated!
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### Author:  [@jeff\_fmod](https://qa.fmod.com/u/jeff_fmod)
#### Post date: [March 2, 2022, 5:12am UTC](https://qa.fmod.com/t/fmod-version-mismatch/18431/2 "2022-03-02T05:12:33Z")
Does it work if you use the old 2.01 banks, and are the examples running correctly?