Pascal VOC export failed error "Invalid XML: missing bndbox"

TL;DR

Fix this in Pascal VOC by acting on the exact message first: add the missing bndbox element with xmin, ymin, xmax and ymax for every object, and drop or repair objects that have a box in the source with no coordinates. Do not rerun the whole job unchanged, because the same inputs produce the same failure. Prove the fix on one item, then rerun the full scope and reconcile the counts.

Invalid XML: missing bndbox

Use this when

• The operation in Pascal VOC fails with this exact message: Invalid XML: missing bndbox.
• The same failure repeats on retry with unchanged inputs.
• A review, export or check is blocked until this item completes.

Not for this skill when

• The message is a permission or outage notice from the platform. Resolve that first, then return here if this error remains.
• The operation completes and you only disagree with its output. That is a quality review, not this failure.

Steps

1. Reproduce the failure with the smallest scope that still shows it in Pascal VOC, and copy the full message plus the item, user or metric involved into the run notes. Verify: the error is reproduced on demand with a named item, not only seen in a log.
2. Apply the specific fix for this error: add the missing bndbox element with xmin, ymin, xmax and ymax for every object, and drop or repair objects that have a box in the source with no coordinates. Verify: parse the XML and assert every object has exactly one bndbox with ordered corners.
3. Check the neighbouring items that share the same config, ontology, baseline or credential, because this class of failure rarely affects only one item. Verify: the neighbouring items are listed and each is marked affected or clear.
4. Compare the result counts, decisions or alerts against the source in Pascal VOC so a silent partial success is caught before sign off. Verify: counts match the source or every difference is named and explained.
5. Rerun the original operation in Pascal VOC on the previously failing scope, watching for the same message rather than assuming success from a quiet log. Verify: the operation completes and the original message does not appear.
6. Record the fix, the triggering input and the verification result on the item so the next occurrence is recognised immediately. Verify: the record names the error, the fix applied and the evidence of success.

Why it happens

Pascal VOC requires a bndbox per object; converters that skip difficult or truncated objects still write the object element and leave the file invalid.

Variant phrasings

Invalid XML: missing bndbox

The verbatim form searchers paste from the terminal or console. Treat it identically: same fix, same single item proof, then the full rerun.

How to fix: Pascal VOC export failed error "Invalid XML: missing bndbox"

The how-to phrasing for the same failure in Pascal VOC. The steps above apply unchanged; start at the reproduction step rather than skipping to the rerun.

Pascal VOC troubleshooting for this failure

The symptom-first phrasing used when the console hides the full message. Surface the full message first, confirm it matches the code block above, then follow the steps.

Compatibility: Pascal VOC at current versions, plus the platform API or console the query names; no extra tooling beyond a text editor and the source system access needed to verify counts.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_QJdrAUP5JA-gxQiNnLXy7Q