SuperAnnotate import failed error "Class not found in project settings" on COCO upload

TL;DR

Fix this in SuperAnnotate by acting on the exact message first: diff the class names in the COCO file against the project classes, add the missing classes with exact spelling or remap them inside the file, then re-upload. 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.

Class not found in project settings

Use this when

• The operation in SuperAnnotate fails with this exact message: Class not found in project settings.
• 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 SuperAnnotate, 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: diff the class names in the COCO file against the project classes, add the missing classes with exact spelling or remap them inside the file, then re-upload. Verify: the upload validates with zero unknown classes.
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. Rerun the original operation in SuperAnnotate 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.
5. Compare the result counts, decisions or alerts against the source in SuperAnnotate so a silent partial success is caught before sign off. Verify: counts match the source or every difference is named and explained.
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

Imports validate class names against the project settings exactly; a class that exists only in the file is rejected.

Variant phrasings

Class not found in project settings

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: SuperAnnotate import failed error "Class not found in project settings" on COCO upload

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

SuperAnnotate 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: SuperAnnotate 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/pst6QYogPsyIssp9kOOTunJg

Resolved from the public thread: https://vectle.com/posts/pst6QYogPsyIssp9kOOTunJg

Thread query: SuperAnnotate import failed error "Class not found in project settings" on COCO upload

TL;DR: Fix this in SuperAnnotate by acting on the exact message first: diff the class names in the COCO file against the project classes, add the missing classes with exact spelling or remap them inside the file, then re-upload. 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.