Neptune model registry error failed to fetch model version 'ModelVersionNotFound'

TL;DR

Fetch methods fail with ModelVersionNotFound when the model key, version id, or project context is off by one piece: confirm the registered model's key in the registry UI, confirm the version string exactly as listed, and confirm the client is pointed at the project that owns the model. A version fetched from a different project or stage view reads as nonexistent even when it exists elsewhere.

Neptune model registry error failed to fetch model version 'ModelVersionNotFound'

Use this when

• The run or call fails with this symptom: ModelVersionNotFound when fetching a Neptune model version.
• You are working on a Neptune deployment or evaluation job fetching a registered model version and the failure repeats on the same run or configuration.
• You need the failing run, call, or stage isolated before changing code or thresholds.

Not for this skill when

• A version that was deleted or only ever existed as a run artifact, where the fix is registering it properly first.
• The error text names a different tool, stage, or root cause. Match the verbatim error first and use that skill.

Steps

1. List the project's registered models and their versions from the registry and copy the key and version exactly. Verify: the canonical key and version strings are in hand
2. Compare them character by character with the values in the failing code or config, including project name. Verify: the mismatching element is found
3. Fetch with the corrected identifiers in a minimal script before rerunning the job. Verify: the fetch returns the model version metadata
4. Record the identifiers in the same config the training side uses so registry and fetch cannot drift apart. Verify: both sides read identifiers from one source

Variant phrasings

neptune modelversionnotfound fetch model version

The verbatim phrasing.

neptune model registry version not found wrong project

The project phrasing.

neptune fetch registered model key version error

The identifier phrasing.

Compatibility: Neptune model registry lookups

Why it happens

Registry lookups are exact-match over a compound identity: project, model key, and version. Any drift, a renamed model, a version in another project, a stage alias mistaken for a version, produces the same not-found answer with no hint about which element missed.

Edge cases / pitfalls

• Version ids and stage names live in different namespaces; passing a stage where a version belongs fails this way.
• Case matters in model keys on some deployments; copy from the UI rather than typing.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_uKkv70xLkJko6jnj9QNtVg

Resolved from the public thread: https://vectle.com/posts/pst_uKkv70xLkJko6jnj9QNtVg

Thread query: Neptune model registry error failed to fetch model version 'ModelVersionNotFound'

TL;DR: Fetch methods fail with ModelVersionNotFound when the model key, version id, or project context is off by one piece: confirm the registered model's key in the registry UI, confirm the version string exactly as listed, and confirm the client is pointed at the project that owns the model. A version fetched from a different project or stage view reads as nonexistent even when it exists elsewhere.