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Version mismatch detect make sure the runtime dlls are in sync with the deployed metadata

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Posted on by Tu Le

Hi everyone

I encountered this error when running unit test, after completing Service Update 10.0.39 (on dev environment), Build model, and sync database.

dashboard of D365 open still ok, no error , Service updated successfully.

I try to stop service SQL reporting, stop iis , refresh model, full build (with customn models), and sync database but it not work.

Message Error : Serialization version mismatch detect, make sure the runtime dlls are in sync with the deployed metadata. Version of file '209'. Version of dll '208'.

Thanks for your help

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Anton Venter 20,345 Super User 2025 Season 2 on at

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Hi,

You will have to update the unit test because some binaries are outdated I guess. I have only had this exact same error on my build pipeline where I had to update the NuGet packages.

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Hana Xue Microsoft Employee on at

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Hi,
This document mentions this error, you can check if it helps. Troubleshoot on-premises deployments - Finance & Operations | Dynamics 365 | Microsoft Learn

Best Regards,
Hana

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Tu Le 22 on at

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@Hana Xue

Thanks Hana Xue, but I see Product Version & platform version are installed on dashboard, where can I check development or build environments and deployed on-premises environment

- "To fix the error, generate the package on a version that is the same as or earlier than the version that is deployed in the on-premises environment."

It's mean I redeploy down version to 10.0.38 right ?

This issue occur on my local environment.

Best Regards,
Tu Le

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Tu Le 22 on at

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Anton Venter

Thanks Anton Venter , This mean I need update version binaries of testcase ? , I see on this project own list test don't have reference to any library. This issue ever happened last year , but on build version 10.0.38 I installed it at the beginning of the year 2024 , it work ok , no error occur

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