What does HRESULT 0xC00D119E (NS_E_WMP_ALREADY_IN_USE) mean?

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Description:

Windows Media Player is already in use. Stop playing any items, close all Player dialog boxes, and then try again.%0

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NS_E_WMP_INVALID_ASX	NS_E_WMP_IMAPI_FAILURE

NS_E_WMP_ALREADY_IN_USE

Diagnosing NS_E_WMP_ALREADY_IN_USE in the Windows Media Player playback path

NS_E_WMP_ALREADY_IN_USE (0xC00D119E) is returned when the requested Player operation conflicts with an active modal dialog, playback task or exclusive internal workflow.

Treat this as an ownership or workflow-state conflict. Record the active dialog, operation, or object that holds the Player state, then retry only after that owner has completed or released it.

Controlled playback comparison

Capture the resource identity and current openState/playState, modal windows, burn/rip/sync tasks, automation caller and thread.
Verify that the caller uses the current Playlist, Media, Network, graph, device or DRM object instance.
Run the narrow experiment: stop active operations, close Player dialogs, wait for state-change completion and invoke the method once.
Do not combine this focused test with a codec-pack change, Player reset, or broad registry cleanup.
If the retest returns a different specific HRESULT, diagnose that new failure as the next stage.

Actions that obscure the cause

starting a second hidden Player instance to bypass serialization.

Technical references

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