# Error Reference (https://jackin.tailrocks.com/reference/errors/)



jackin' uses stable error codes (`E001`–`E016`) for the most common operator-visible failures. When jackin' encounters one of these failures, it prints a structured error block with the code, a one-line headline, and a remediation hint. Pass `--debug` to see the full internal error chain alongside the structured block.

## Error codes [#error-codes]

| Code                            | Headline                             |
| ------------------------------- | ------------------------------------ |
| [E001](/reference/errors/E001/) | Docker daemon not reachable          |
| [E002](/reference/errors/E002/) | Docker version too old               |
| [E003](/reference/errors/E003/) | Out of disk space for image build    |
| [E004](/reference/errors/E004/) | Role manifest invalid                |
| [E005](/reference/errors/E005/) | Role manifest version unsupported    |
| [E006](/reference/errors/E006/) | Role source not trusted              |
| [E007](/reference/errors/E007/) | Workspace not found                  |
| [E008](/reference/errors/E008/) | Workspace config version unsupported |
| [E009](/reference/errors/E009/) | Container name conflict              |
| [E010](/reference/errors/E010/) | DinD sidecar failed health check     |
| [E011](/reference/errors/E011/) | Port conflict on DinD TLS port       |
| [E012](/reference/errors/E012/) | GitHub CLI authentication failed     |
| [E013](/reference/errors/E013/) | 1Password CLI not signed in          |
| [E014](/reference/errors/E014/) | Capsule binary download failed       |
| [E015](/reference/errors/E015/) | Worktree materialization conflict    |
| [E016](/reference/errors/E016/) | Unsupported OTLP protocol            |

Run `jackin doctor` to surface potential issues before they become errors.