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NS_E_WMPCORE_PLAYLIST_EVENT_ATTRIBUTE_ABSENT
How to classify this WMP result
The symbolic result NS_E_WMPCORE_PLAYLIST_EVENT_ATTRIBUTE_ABSENT narrows 0xC00D10A6 to the playback core playlist event attribute absent condition: a required attribute is absent from a playlist EVENT block. Keep the playback core playlist event attribute absent boundary visible when a later dialog reduces it to a general media error.
An additional test is to record the EVENT XML, required attribute and Player version interpreting it; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
What succeeds before this failure
Representative case: The event element is well-formed but incomplete for WMP semantics. The example isolates only the producing component.
State worth preserving
Capture state before Player cleanup:
- Decisive check: record the EVENT XML, required attribute and Player version interpreting it.
- Artifact: current item index, alternate index and nested-playlist depth.
- State: repeat/event boundary and the media object expected at its start or end.
- Object identity: playlist URL, format, response content type and exact downloaded bytes.
- Underlying evidence: ASX version and element stack at the failure.
- Correlation: resolved base URL for REF or ENTRYREF targets.
Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.
Reproduce without destroying evidence
- Preserve
0xC00D10A6, the ErrorItem context and the object generation involved in the failing operation. - Compare the failing artifact with a known-good artifact that differs only in the suspected property.
- Separate acquisition, parsing, object construction, playback and persistence until the component that produced the failure is clear.
- Confirm the failure directly: record the EVENT XML, required attribute and Player version interpreting it.
- After you add the documented attribute with a valid value, recreate the owning WMP object and verify that the corrected generation completes.
Related HRESULTs, different boundaries
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_PLAYLIST_EVENT_EMPTY | The EVENT block contains no playable entries or references |
NS_E_WMPCORE_PLAYLIST_NO_EVENT_NAME | An EVENT block lacks the event name needed to match a script command |
NS_E_WMPCORE_MEDIA_ALTERNATE_REF_EMPTY | An alternate/rollover reference exists but its URL is empty |
If this result is followed by a broader “cannot play,” “cannot load,” or “operation failed” result, preserve the earlier event. A later wrapper error may be secondary.
Recovery at the right layer
Change the responsible precondition rather than masking the symptom: add the documented attribute with a valid value. A retry is meaningful only after that recorded condition changes.
- Avoid flattening or rewriting a playlist before preserving the failing nesting and base-URL rules; it can destroy the artifact or state needed to explain this result.
- Avoid assuming every unplayable item means the playlist parser itself failed; 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 0xC00D10A6 and one corrected fixture that changes only the identified precondition. This condition correction is complete when the intended operation succeeds without being replaced by a neighboring WMP HRESULT.
Practical interpretation
Use this result, 0xC00D10A6 and the symbolic phrase in traces. Correlate search keys with API and object.
Technical references
- Windows Media metafile reference — API or format context for this HRESULT.
- Metafile elements reference — documentation used to identify the producing boundary of this result.
- ENTRYREF element — normative or platform material relevant to this result.
- REPEAT element
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