Hi Deepmla Sharma

Can you share the snippets from your appsettings.json and Startup.cs relating to Language Manager please? 

If this problem is only occurring on DXP environment (and not locally on your development machine) then it may be worth looking at the app settings JSON files transforms (e.g. in appsettings.Integration.json).

Thanks,
Jon

Hi Jon Williams,

We have the add-on of Language manager so don't have anything related to Language manager in Startup and Appsetting.json files.

In our local developer machine working fine.

Thanks,

Deepmala

Have you verified that the addon is included in your modules folder when you deploy? 

The issue appears to be related to dependency injection, as it indicates that ILanguageManagerConfig  is not registered. I suspect that a related dependency or AddOn registration may be missing. You can also try registering it explicitly in your local environment to validate.

You may also want to double check that you have the 'EPiServer.Labs.LanguageManager.dll' published to the 'bin' folder on your Integration environment. 

Hi Jon Williams, Pär Wissmark , Sanjay Kumar,

We were facing 2 issue - TinyMCE initialization failure and Language manager disapear.

Over the past few weeks, several Optimizely CMS projects began experiencing a puzzling failure: XHtmlString fields stopped initializing TinyMCE in the edit interface. The editor simply refused to load, leaving users unable to manage rich text content. This issue surfaced in multiple unrelated projects, so it was clear the root cause wasn’t project-specific code.

Now we follow the steps according to given in below link. Both issue resolved and deployment is happening properly from pipeline.
https://powerbuilder.home.blog/2025/12/08/fixing-tinymce-initialization-failures-in-optimizely-cms-a-hidden-pipeline-issue-with-net-sdk-versions/

Thanks,

Deepmala Sharma

Hi Deepmla Sharma.

I'm glad that you manage to solve it. 

Thanks for coming back on this thread.

Warm regards,
Jon