Windows error 14014 (ERROR_SXS_INVALID_XML_NAMESPACE

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The side-by-side manifest contains an invalid XML namespace URI and cannot be interpreted.

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ERROR_SXS_UNKNOWN_ENCODING	ERROR_SXS_ROOT_MANIFEST_DEPENDENCY_NOT_INSTALLED

ERROR_SXS_INVALID_XML_NAMESPACE_URI

ERROR_SXS_INVALID_XML_NAMESPACE_URI means that the manifest contains an invalid XML namespace URI. For a conventional Windows side-by-side assembly manifest, the required default namespace on the assembly element is part of the format Windows uses to interpret the document.

What to check

Check the root assembly element and all namespace declarations for spelling, quoting, and unintended template substitutions.
Compare the deployed manifest with the documented application-manifest schema rather than repairing only the reported attribute.
Ensure XML transformations preserve namespace declarations when merging or generating manifests.

A syntactically valid URI can still be invalid for the Windows SxS manifest schema if it is not the expected namespace.

Microsoft: application manifests

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