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NS_E_WMPCORE_NO_REF_IN_ENTRY
What this HRESULT actually isolates
The symbolic result NS_E_WMPCORE_NO_REF_IN_ENTRY narrows 0xC00D1090 to the playback core no REF in entry condition: an ASX ENTRY element has no usable REF child after parsing. Keep the playback core no REF in entry boundary visible when a later dialog reduces it to a general media error.
An additional test is to record the ENTRY XML, REF child count and every rejected HREF value; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
State worth preserving
Capture state before Player cleanup:
- Decisive check: record the ENTRY XML, REF child count and every rejected HREF value.
- Artifact: playlist URL, format, response content type and exact downloaded bytes.
- State: ASX version and element stack at the failure.
- Object identity: resolved base URL for REF or ENTRYREF targets.
- Underlying evidence: current item index, alternate index and nested-playlist depth.
- Correlation: repeat/event boundary and the media object expected at its start or end.
Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.
Reproduce without destroying evidence
- Start with the symbolic value this result; do not diagnose the failure from the final dialog alone.
- Record the bytes or object state that produced this condition before automatic recovery mutates it.
- Exclude a stale callback or superseded object generation as the source of this event.
- Use this deciding observation for this condition: record the ENTRY XML, REF child count and every rejected HREF value.
- Apply the smallest supported remedy for this condition: add a syntactically valid REF/HREF to that ENTRY or remove the empty ENTRY.
What succeeds before this failure
Two rules frame this diagnosis. First, windows Media metafiles are XML documents, but a well-formed document can still violate required ASX element and attribute rules. In this case, relative references are resolved against the containing metafile URL, and nested playlists introduce a stack and a new base URL rather than a simple flat list.
Representative case: The ENTRY has metadata such as TITLE but no media reference that can be resolved. The example isolates only the producing component.
Related HRESULTs, different boundaries
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_WMX_LIST_ATTRIBUTE_NAME_EMPTY | A list-level WMX attribute is present with an empty name |
NS_E_WMPCORE_WMX_LIST_ATTRIBUTE_VALUE_EMPTY | A recognized list-level WMX attribute has an empty value where one is required |
NS_E_WMPCORE_PLAYLIST_EMPTY_OR_SINGLE_MEDIA | The requested playlist operation requires multiple items, but the list has at most one |
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
The targeted correction for this condition is to add a syntactically valid REF/HREF to that ENTRY or remove the empty ENTRY. Keep the original failing input until the same operation succeeds after one controlled change.
- 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.
Practical interpretation
Use this result, 0xC00D1090 and the symbolic phrase in traces. Correlate search keys with API and object.
How to know the repair is real
After correction, create a fresh Player, control, parser or playlist object and rerun the smallest reproducer for this HRESULT. Verify the resulting resource, list membership, saved file, library object or play state.
Technical references
- Windows Media metafile reference — documentation used to identify the producing boundary of it.
- Metafile elements reference — normative or platform material relevant to it.
- ENTRYREF element — API or format context for this HRESULT.
- REPEAT element It.
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