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ERROR_SXS_MULTIPLE_DEACTIVATION
ERROR_SXS_MULTIPLE_DEACTIVATION — The same activation context was deactivated more than once.
The activation cookie has already been consumed by a prior DeactivateActCtx call. A second deactivation corrupts the intended stack discipline and Windows rejects it.
This often occurs when both a normal path and an error-cleanup path release the same context.
What to check
- Give each activation cookie one clear owner.
- Reset or invalidate the stored cookie immediately after deactivation.
- Use a scoped wrapper that prevents double cleanup in all return and exception paths.
Microsoft: Activation Context reference
Microsoft: About Side-by-Side assemblies
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