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NS_E_WMPCORE_ERRORMANAGERNOTAVAILABLE
What this HRESULT means
The symbolic result NS_E_WMPCORE_ERRORMANAGERNOTAVAILABLE narrows 0xC00D108D to the playback core error manager not available condition: the playback core has no internal error-manager service available for the requesting object. Keep the playback core error manager not available boundary visible when a later dialog reduces it to a general media error.
An additional test is to record core generation, requesting object and the transition that created or released the service; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
State worth preserving
Capture state before Player cleanup:
- What to verify: record core generation, requesting object and the transition that created or released the service.
- Artifact: IWMPRemoteMediaServices result and isRemote/docked state.
- State: GIT cookie or marshaled event-interface generation.
- Object identity: shutdown order for host window, control, playback engine and plug-ins.
- Underlying evidence: host process and control version, uiMode and remote/local service type.
- Correlation: COM apartment type and thread that created the control.
Reproduce without destroying evidence
- Preserve
0xC00D108D, the ErrorItem context and the object instance involved in the failing operation. - After you recreate the core/requesting object in a valid state before inspecting queued core errors, recreate the owning WMP object and verify that the corrected generation completes.
What succeeds before this failure
Two platform rules frame the diagnosis. First, a local ActiveX control, a remoted control and the full-mode Player can share playback services while still having different window, docking and lifetime states. In this case, cross-apartment callbacks require valid marshaled interfaces; a working playback engine does not prove that the host still owns a usable event or error interface.
Representative case: A playlist worker reports failure after the core error service has been released during graph teardown.
Related HRESULTs with different meanings
| Result | Different condition |
|---|---|
NS_E_WMPCORE_ERRORSINKNOTREGISTERED | The calling object has no registered sink for asynchronous WMP errors |
NS_E_WMPCORE_FAILEDTOGETMARSHALLEDEVENTHANDLERINTERFACE | The core could not retrieve a usable event-handler interface for the calling COM apartment |
NS_E_WMPCORE_COCREATEFAILEDFORGITOBJECT | COM could not create the process-wide Global Interface Table object used for cross-apartment access |
Recovery at the right layer
Change the responsible precondition rather than masking the symptom: recreate the core/requesting object in a valid state before inspecting queued core errors.
- Avoid reusing an interface pointer directly on another COM apartment; it can destroy the artifact or state needed to explain this result.
- Avoid destroying the host window before recording control state and the first callback failure; that can replace the original HRESULT with a secondary failure from another layer.
How to know the repair is real
Keep one fixture that reproduces 0xC00D108D and one corrected fixture that changes only the identified precondition.
Technical references
- Player control guide — API or format context.
- Remoting the Windows Media Player control — documentation for this result.
- Using skins with the control — normative or platform material relevant to this result.
- IGlobalInterfaceTable interface
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