Windows error 14003 (ERROR_SXS_ASSEMBLY_NOT

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A manifest dependency cannot be found or resolved by Windows side-by-side binding.

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ERROR_SXS_INVALID_ACTCTXDATA_FORMAT	ERROR_SXS_MANIFEST_FORMAT_ERROR

ERROR_SXS_ASSEMBLY_NOT_FOUND

ERROR_SXS_ASSEMBLY_NOT_FOUND means that Windows could not locate an assembly referenced by the active side-by-side manifest. Resolution depends on the complete assembly identity, including attributes such as name, version, processor architecture, language, and public-key token where applicable.

How to investigate

Use sxstrace to capture the exact dependent assembly identity Windows attempted to resolve.
Verify that the required runtime or private assembly matches the application architecture and exact manifest identity.
Repair or reinstall the application or its documented prerequisite rather than copying a DLL from an unrelated machine.

A file with a similar name is not necessarily a valid replacement: side-by-side binding resolves assembly identity, not only a DLL filename.

Microsoft: assembly manifests

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