What does Windows error code 14018 (ERROR_SXS_MANIFEST_MISSING_REQUIRED_DEFAULT_NAMESPACE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The assembly element lacks the Windows SxS default namespace.

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ERROR_SXS_INVALID_ASSEMBLY_IDENTITY_ATTRIBUTE	ERROR_SXS_MANIFEST_INVALID_REQUIRED_DEFAULT_NAMESPACE

ERROR_SXS_MANIFEST_MISSING_REQUIRED_DEFAULT_NAMESPACE

ERROR_SXS_MANIFEST_MISSING_REQUIRED_DEFAULT_NAMESPACE means that the manifest's assembly element lacks the default namespace required by the Windows SxS manifest format. Without it, Windows cannot interpret otherwise familiar element names as side-by-side manifest elements.

How to correct the manifest

Add the required default namespace to the root assembly element according to the Windows manifest schema.
Check that XML generators do not replace the default namespace with a prefixed namespace or drop it during serialization.
Validate the final installed manifest, not only the source template.

This is a manifest-format defect; reinstalling a runtime cannot repair a missing namespace in an application-owned manifest.

Microsoft: application manifests

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