# Initializing core results in FMOD\_ERR\_HEADER\_MISMATCH - can't find a fix

**URL:** <https://qa.fmod.com/t/initializing-core-results-in-fmod-err-header-mismatch-cant-find-a-fix/22969>\
**Category:** FMOD Engine\
**Tags:** windows, cpp\
**Created:** [May 23, 2025, 7:43pm UTC](https://qa.fmod.com/t/initializing-core-results-in-fmod-err-header-mismatch-cant-find-a-fix/22969 "2025-05-23T19:43:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jakiessapy](https://avatars.discourse-cdn.com/v4/letter/j/77aa72/32.png) [@jakiessapy](https://qa.fmod.com/u/jakiessapy)\
**Post date:** [May 23, 2025, 7:43pm UTC](https://qa.fmod.com/t/initializing-core-results-in-fmod-err-header-mismatch-cant-find-a-fix/22969/1 "2025-05-23T19:43:03Z")

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Hi!

Whenever I initialize Studio API I get FMOD\_ERR\_HEADER\_MISMATCH result. I tried reinstalling both Studio API and the Studio itself but I still got the same issue. Is there any other way I could try to fix this?

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<div class="post-metadata">

**Author:** ![jakiessapy](https://avatars.discourse-cdn.com/v4/letter/j/77aa72/32.png) [@jakiessapy](https://qa.fmod.com/u/jakiessapy)\
**Post date:** [May 25, 2025, 11:46am UTC](https://qa.fmod.com/t/initializing-core-results-in-fmod-err-header-mismatch-cant-find-a-fix/22969/2 "2025-05-25T11:46:47Z")

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Resolved - mismatched DLLs.