# failure model_region
ClientError: 404 NOT_FOUND. {'error': {'code': 404, 'message': 'Publisher model `projects/vertex-ai-experminent/locations/us-central1/publishers/google/models/gemini-3.8-flash` was not found or your project does not have access to it. Ensure you are using a valid model name and that the model is available in the specified region. For more information, see: https://docs.cloud.google.com/gemini-enterprise-agent-

# failure app_name
ValueError: App name docs_helper is not valid. It should either be the full ReasoningEngine resource name, or the reasoning engine id.

# conversation 1 · session 4465463788115591168
> I run shipctl 1.x. How do I undo release r42 in production?
call   read_page {"page": "rollback"}
result read_page ["page", "text"]
answer In shipctl 1.x, use `shipctl release revert`:

```bash
shipctl release revert r42 --env production
```
*(or `shipctl release revert r42` if your default environment is production).*

Note that database migrations are not rolled back automatically; any migrations run by r42 must be reversed with a new migration. In shipctl 2.x, this was replaced by `shipctl rollback --env production --to <release>`.

# ingest returned in 0.03 s; search right after: 0 memories
# searchable after about 4 s:
  - I run shipctl 1.x.

# conversation 2 · session 3635675556772577280
> How do I undo the last production release?
call   load_memory {"query": "shipctl version"}
call   read_page {"page": "rollback"}
result load_memory {"result": {"memories": [{"content": {"parts": [{"text": "I run shipctl 1.x."}], "role": "user"}, "custom_metadata": {}, "author": "user", "timestamp": "2026-10-22T01:31:50.920516+00:00"}]}}
result read_page ["page", "text"]
answer Since you are using shipctl 1.x, run:

```bash
shipctl release revert <release>
```

Specify the release identifier you want to revert to. Note that database migrations are not automatically rolled back, so any migrations run in the last release must be reversed with a new migration.

# list_sessions for dana: 2 sessions