NTSTATUS 0xC015000C (STATUS_SXS_ASSEMBLY

Status / error code:

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Description:

A required side-by-side assembly is absent from loader search locations.

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STATUS_SXS_THREAD_QUERIES_DISABLED	STATUS_SXS_PROCESS_DEFAULT_ALREADY_SET

STATUS_SXS_ASSEMBLY_MISSING

Resolve the exact missing assembly identity

Side-by-side binding uses an assembly identity that can include name, version, architecture, language, and public-key token. Installing a similarly named runtime is not sufficient if one identity field differs from the dependency recorded in the manifest.

Use the activation trace to find the requesting manifest, the complete dependent identity, and every path searched. This separates a genuinely absent assembly from an architecture mismatch, policy redirection problem, or private assembly deployed beside the wrong executable.

What to inspect

Run sxstrace while reproducing the launch or activation failure and parse the trace.
Compare the dependency identity with the installed assembly manifest and application architecture.
Check embedded and external application manifests and private assembly directories.
Repair or deploy the exact dependency instead of copying individual DLLs without their manifest.

References

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