Getting exception after upgrading to 30.9.1

2025/08/30 3:35 PM

After upgrading to to 30.9.1 from 30.5.3 I am getting an error while accessing the admin ui or even running dotnet run --xkp-ci-store

fail: Kentico.Web.Mvc.KenticoErrorHandlingMiddleware[0]````System.Resources.MissingManifestResourceException: No manifests exist for the current culture.

I have tried specifying the DefaultCultureCode in program.cs

builder.Services.Configure<AdminLocalizationOptions>(options =>
{
    options.DefaultCultureCode = "en-US";
    options.SupportedCultures = [
        new AdminCulture { CultureCode = "en-US", DisplayName = "English (United States)" }
    ];
});

Revert to 30.8.3 and all is good.

Environment

  • Xperience by Kentico version: [30.9.1]

  • .NET version: [8]

  • Execution environment: [local]

Tags:
Migration / upgrade v30.9.0

Answers

2025/08/30 3:42 PM

Hi Tim,

You are not alone, it is been 3 days i had thr same issue i looked on mostly all attach nuggets and i still not find the issue. But when i updated dancing goat it worked. Community portal gave the same issue also after version 30.9.0

2025/08/31 12:07 AM

I haven't looked into this myself (haven't prioritized updating the Kentico Community Portal yet) but I think it's related to integrations, not Xperience's core libraries.

This would explain why Dancing Goat works but other projects do not.

It can take us a up to a week or two to get all integrations updated because they depend on the public NuGet packages and have to wait for the Refresh to be publicly released.

I believe this issue has been reported to our team, but if you share your package dependencies when filing a support request it might help resolve the issue faster.

2025/08/31 12:26 AM

Hi sean,

I knowmit has to be an integration, the issue is we dont find exactly witch integration is doing this problem. In debuging we dont see where it is coming from. It show only when website is start to run

2025/09/01 12:41 PM

Our developers are already looking into this issue - multiple customers are having this issue as well. At this moment it seems that the devs identified the source of the issue and are currently working on a fix. Hopefully it will be available this week!

2025/09/02 1:53 PM

We have the same issue, when I played around with the Dancing Goat website I got it to break when I installed the Kentico.Xperience.TagManager package. I also notified Kentico Support of this find. If you have that installed and aren't using it then you could remove it and that could fix your issue in the mean time.

2025/09/02 3:55 PM

Hi alex, you are right its Kentico.Xperience.TagManager package the problem, other packages are working like charm. When i disabeled everything worked. Thank you for your help

2025/09/03 9:50 PM
Accepted answer

Edit: This was resolved in v30.9.2.

This doesn't appear to be a bug with the TagManager integration, but if you are using that and running v30.9.1 you will experience the bug.

A fix to Xperience is being released tomorrow (2025/09/03), 1 week from the bug report as part of our normal 7-day bug fix policy.

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