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ERROR_SXS_MANIFEST_INVALID_REQUIRED_DEFAULT_NAMESPACE
ERROR_SXS_MANIFEST_INVALID_REQUIRED_DEFAULT_NAMESPACE means that the root assembly element has a default namespace, but it is not the namespace required for the Windows SxS manifest schema. Windows therefore rejects the manifest even when the XML itself is well formed.
How to correct the manifest
- Set the root default namespace to the value required by the documented Windows side-by-side manifest format.
- Check for template substitutions or XML transforms that replaced the namespace URI.
- Keep namespace declarations consistent across the application manifest and any private assembly manifests.
Do not replace the namespace with a guessed URI; use the exact schema value required by the target manifest format.
Microsoft: application manifests
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