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ERROR_SXS_DUPLICATE_CLSID
ERROR_SXS_DUPLICATE_CLSID means that more than one active SxS assembly declares the same COM class identifier. Windows cannot bind the class unambiguously because the active activation context contains competing COM-server registrations.
How to investigate
- Use the trace and manifests to identify every assembly that declares the CLSID.
- Keep one authoritative implementation for a CLSID within an activation context; use a new CLSID for a different COM class.
- Check generated COM manifests and private assemblies added by setup or plug-ins.
The same CLSID in separate, non-overlapping contexts may be intentional; the error occurs when conflicting registrations are active together.
Microsoft: activation contexts
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