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ERROR_MUI_INVALID_LOCALE_NAME
ERROR_MUI_INVALID_LOCALE_NAME means the locale recorded for a MUI resource is not valid for the resource loader. The language-specific file and its directory must identify a valid language for the deployed resource set.
What to check
- Check the language folder name and the locale value emitted by the resource build process.
- Use consistent locale names across the package manifest, resource configuration, and installer layout.
- Rebuild the affected language resources when the project moved between localization or packaging systems.
Microsoft: MUI Resource Management
Microsoft: Deploying multilingual resources
Microsoft: About Multilingual User Interface
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