error codes

Error Codes Reference

Every user-facing error in the ɳSelf CLI includes a stable code, a plain-language explanation, and a suggested fix. This page is the catalog for all registered error codes.

---

How errors appear in the CLI

An error that carries a code (a structured error, or a known failure such as Docker not running) prints a block on stderr:

Error: [E001] Docker not installed
  Why: The docker binary was not found in PATH.
  Fix: Install Docker: https://docs.docker.com/get-docker/
  Docs: https://nself.org/docs/reference/error-codes#e001

The Why, Fix and Docs lines appear only when they have content. Every other error still prints one line, Error: <message>, and exits 1.

The code in brackets (e.g., [E001]) is stable across CLI versions. You can search this page by code to find the cause and fix. The exit status is the Exit column of the code's row; see Exit-Codes for the classes.

The coded block and the exit classes (2, 3, 4) are v1.5 behaviour. They are on from v1.5.0 and opt-in before that with NSELF_V15=1; see Compat-V15. Without it, errors print as Error: <message> and exit 1.

---

Looking up an error

• Copy the bracketed code from the terminal output (e.g., E102).
• Search this page for that code (Ctrl+F or Cmd+F).
• The fix column gives you the fastest path to resolution.

---

Docker (E001-E049)

These errors occur when the CLI cannot find or communicate with Docker.

Code	Exit	Summary	Why	Fix
E001	2	Docker not installed	The docker binary was not found in PATH.	Install Docker: https://docs.docker.com/get-docker/
E002	2	Docker daemon not running	The Docker daemon is not responding to commands.	Start Docker Desktop or run: sudo systemctl start docker
E003	2	Docker Compose not available	docker compose v2 plugin is not installed.	Update Docker Desktop or install the compose plugin manually.
E004	2	docker-compose.yml not found	No docker-compose.yml exists in the project directory.	Run nself build to generate the compose file.
E005	2	Port conflict	A required port is already in use by another process.	Run nself doctor to identify the conflict, then stop the conflicting process or change the port in .env.

---

Config (E050-E099)

These errors occur during configuration validation or when reading .env files.

Code	Exit	Summary	Why	Fix
E050	1	No .env file found	No .env or .env.dev file exists in the project directory.	Run nself init to generate a configuration file.
E051	1	Invalid config key	The configuration key contains invalid characters.	Config keys must contain only A-Z, 0-9, and underscores.
E052	1	Config validation failed	One or more configuration values are invalid.	Run nself config validate to see all issues, then fix the reported values.
E053	1	Weak password detected	A password field does not meet minimum length or contains insecure patterns.	Use a strong, randomly generated password of at least 16 characters.
E054	1	Invalid project name	Project name contains characters not allowed in Docker and DNS contexts.	Use only lowercase letters, numbers, and hyphens. Must start with a letter.
E055	1	Duplicate route detected	Two or more services are configured with the same nginx route.	Check ROUTE values in .env and ensure each service has a unique route.
E056	1	Unknown config key	The key is not recognized by nself.	Check for typos. Run nself config list to see all valid keys.
E057	1	Insecure password pattern	A password matches a known insecure pattern such as a dictionary word, a repeated character or a default value.	Replace it with a randomly generated password of at least 16 characters.
E058	1	CORS wildcard not allowed in production	The CORS origin list contains a wildcard while the environment is production.	List the exact origins in HASURA_GRAPHQL_CORS_DOMAIN, or use a development environment for wildcards.
E059	1	Secret is empty or a placeholder	A required secret is empty or still holds a placeholder value from the template.	Generate a real value and set it in .env, then run the command again.

---

Plugin and License (E100-E149)

These errors occur when installing plugins or validating license keys.

Code	Exit	Summary	Why	Fix
E100	1	Plugin not found	The requested plugin does not exist in the registry.	Run nself plugin list to see available plugins.
E101	3	Invalid license key	The license key format is invalid.	License keys start with nself_pro_ followed by 32+ characters. Check your key.
E102	3	License tier insufficient	Your license tier does not include this plugin.	Upgrade your plan at https://nself.org/pricing
E103	3	License expired	The license key has expired.	Renew your license at https://nself.org/account
E104	3	License validation failed (network)	Cannot reach the license server and no valid local cache exists.	Check your internet connection. Previously validated licenses work offline for 7 days.
E105	1	Circular plugin dependency	Plugin dependency graph contains a cycle.	Report this as a bug at https://github.com/nself-org/cli/issues
E106	1	Invalid plugin manifest	The plugin manifest is missing a required field or contains an invalid value.	Fix the manifest fields named in the message, or reinstall the plugin: nself add
E107	1	Plugin is not signed	A stable plugin release has no signature, so the install was refused.	Use a release that carries a signature, or report the missing signature to the plugin publisher.
E108	1	Plugin checksum missing	A stable plugin release has no checksum, so the install was refused.	Use a release that carries a checksum, or report the missing checksum to the plugin publisher.
E109	1	Duplicate plugin slug	The same plugin slug is served by more than one unrelated registry entry.	Report this to the registry maintainers. Install the plugin by its full registry name if one is shown.
E110	3	License does not entitle this plugin tier	The installed license does not include the pro tier of this plugin.	Check your plan with: nself license status. Upgrade at https://nself.org/pricing if the tier is missing.

---

SSL and Network (E150-E199)

These errors occur during SSL certificate generation or network operations.

Code	Exit	Summary	Why	Fix
E150	2	mkcert not installed	mkcert is not installed; falling back to OpenSSL self-signed certs.	Install mkcert: brew install mkcert (macOS) or see https://github.com/FiloSottile/mkcert
E151	2	SSL certificate generation failed	Could not generate SSL certificates for the configured domain.	Check domain configuration and ensure openssl is available.

---

Database, Backup and Recovery (E200-E249)

These errors occur when the CLI interacts with the PostgreSQL container, backups, restores and disaster recovery.

Code	Exit	Summary	Why	Fix
E200	2	Database not running	PostgreSQL container is not running or not accepting connections.	Run nself start to start all services, or nself doctor to diagnose.
E201	2	Migration failed	A database migration could not be applied.	Check the migration SQL for errors. Run nself db migrate status to see pending migrations.
E202	2	Backup failed	Database backup operation failed.	Ensure sufficient disk space and that the database is running.
E203	1	Migration validation failed	The migration dry run found an error in the migration SQL before anything was applied.	Fix the SQL named in the message and run the migration again. No changes were applied.
E204	2	Migration prerequisite missing	An object the migration depends on does not exist in the live schema.	Apply the earlier migrations first: nself db migrate. Run nself doctor if the schema looks wrong.
E205	2	Backup not found	The requested backup file or backup ID does not exist.	List available backups with: nself backup list
E206	2	Backup verification failed	The backup failed its integrity check, so it may be corrupt or incomplete.	Create a fresh backup: nself backup create. Do not restore from the failed file.
E207	2	Backup restore failed	The backup could not be restored into the database.	Check that the database is running and has enough disk space, then retry. Run nself doctor for details.
E208	2	Backup encryption failed	The backup could not be encrypted.	Check the backup encryption key setting and that the key file is readable, then retry.
E209	2	Backup decryption failed	The backup could not be decrypted with the configured key.	Check that the key matches the one used to create the backup, then retry.
E210	2	Remote backup operation failed	Copying a backup to or from the remote destination failed.	Check the remote destination settings and network access, then retry.
E211	2	Backup prune failed	Old backups could not be removed according to the retention policy.	Check file permissions on the backup directory and the remote destination, then retry.
E212	2	WAL archive failed	PostgreSQL could not archive a write-ahead log segment.	Check free disk space and the archive destination. Run nself doctor for details.
E213	2	Disaster recovery drill failed	The disaster recovery drill did not complete successfully.	Read the drill report for the failing step, fix it and run the drill again.
E214	2	Standby promotion failed	The standby database could not be promoted to primary.	Check the standby status and replication lag, then retry the promotion.
E215	2	Disaster recovery rollback failed	Rolling back a disaster recovery step failed.	Check the current database role on each node before taking any further action.
E216	2	Split-brain fence failed	The old primary could not be fenced, so two nodes might accept writes.	Stop the old primary by hand before continuing, then retry the fence step.

---

Health (E250-E299)

These errors occur during health checks run by nself doctor, nself health, nself status and startup probes.

Code	Exit	Summary	Why	Fix
E250	2	Service unhealthy	A service health check returned an unhealthy status.	Run nself doctor --verbose for detailed diagnostics.
E251	2	Health check timeout	The health check did not complete within the timeout period.	The service may be starting slowly. Wait and retry, or check logs with nself logs.
E252	2	Service not found	The named service is not part of this project stack.	Run nself status to list the services in this project, and check the spelling.

---

Init and Project (E300-E349)

These errors occur during nself init or when the CLI validates the working directory.

Code	Exit	Summary	Why	Fix
E300	1	Project already initialized	A .env file already exists in this directory.	Use nself config set to modify existing config, or delete .env to reinitialize.
E301	1	Source directory detected	You are running nself inside the CLI source repository.	Change to your project directory first: cd /path/to/your/project

---

Domain (E350-E399)

These errors occur when the CLI validates domain names or port numbers from config.

Code	Exit	Summary	Why	Fix
E350	1	Invalid domain name	The configured domain name is not valid.	Use a valid domain like example.com or localhost.
E351	1	Invalid port number	Port number is outside the valid range (1-65535).	Use a port number between 1024 and 65535 for non-privileged ports.

---

CLI (E400-E449)

These errors come from the command line itself: usage, JSON support, destructive-action gates and moved commands.

Code	Exit	Summary	Why	Fix
E400	classified	Unclassified error	The command failed with an error that has no specific code.	Read the message. If it looks like a bug, report it at https://github.com/nself-org/cli/issues
E401	1	Invalid usage	A flag or argument was missing, unknown or had an invalid value.	Run the command with --help to see the accepted flags and arguments.
E402	1	JSON output not supported	This command or flag combination cannot produce JSON output.	Run the command without --json, or use nself help --json to see which commands support it.
E403	4	Destructive action blocked	A safety gate refused a destructive action.	Read the message for the missing confirmation or flag, check the target environment, then confirm explicitly.
E404	1	Command moved to a plugin	This command now lives in a plugin that is not installed.	Run the nself add command printed in the message, then run the command again.

---

Reconcile and locks (E450-E479)

Operation-lock codes. The other codes in this block are documented here when their Tickets register them.

Code	Exit	Summary	Why	Fix
E460	1	Project operation lock held	Another nself command is changing this project and holds its operation lock.	Wait for the running nself command to finish, or stop it, then run this command again.

---

JSON error object

With --json (v1.5 mode), a failure writes exactly one error envelope to stdout and the human block above still goes to stderr:

{
  "schema_version": "1",
  "command": "start",
  "error": {
    "code": "E002",
    "message": "docker info failed: docker daemon is not running",
    "cause": "The Docker daemon is not responding to commands.",
    "remediation": "Start Docker Desktop or run: sudo systemctl start docker",
    "docs_url": "https://nself.org/docs/reference/error-codes#e002",
    "exit_code": 2,
    "class": "infra"
  }
}

Field	Rule
code	^E[0-9]{3}$. The error's own code; else the code of the matching known failure (when several match, the highest class wins: auth, then destructive, then infra, then user); else E400.
message	What happened.
cause	Omitted when empty. The Why line.
remediation	Omitted when empty. The Fix line.
docs_url	Omitted when empty. The Docs line.
exit_code	The process exit status.
class	user (1), infra (2), auth (3), destructive_blocked (4), other (any other status).

command is the command path without nself ("" when the failure came before a command was resolved). Message, cause and remediation are redacted: URL credentials, tokens, e-mail addresses and IPs are masked, and raw arguments are never included. The schema is schemas/error.v1.schema.json.

---

Code allocation

Codes are grouped in blocks. A block has exactly one category, so the category of a code follows from its number. A new block or range needs an entry in the plan first; the registry (internal/errs) rejects a code outside its owner's range, a mismatched category, and any code in the reserved range.

Block	Category	Use
E001-E049	docker	Docker and Compose
E050-E099	config	Configuration and secrets
E100-E149	plugin	Plugins, licenses, entitlements
E150-E199	ssl	Certificates
E200-E249	database	Database, migrations, backups, recovery
E250-E299	health	Service health
E300-E349	init	Project setup
E350-E399	domain	Domains and ports
E400-E449	cli	Usage, JSON output, command moves
E450-E479	reconcile	Reconcile, locks, ACME
E480-E499	deploy	Deploy and release verification
E500-E529	adopt	Adopting existing stacks
E540-E549	secret	Secret resolution
E600-E719	reserved	The ci plugin's own registry; never allocated in the CLI

Codes are never reused or renumbered. Several blocks have no registered codes yet; a block appears in the tables above once it has one.

---

Error codes in scripts

If you are scripting around the CLI, branch on the exit status (see Exit-Codes) and parse the bracketed code from stderr, or use --json and read error.code from stdout:

output=$(nself start 2>&1)
if [ $? -ne 0 ]; then
  code=$(printf '%s' "$output" | grep -oE '\[E[0-9]+\]' | head -1)
  printf 'nself failed with %s\n' "$code"
fi

---

Related pages

• Exit-Codes, exit status classes and what changes in v1.5.0
• cmd-doctor, run diagnostics to identify and resolve common errors
• cmd-config, view and edit configuration values
• Plugin-Licensing, license key format and tier details
• Guide-SSL-Setup, SSL certificate setup
• Config-Env-Vars, all environment variable reference

---

← Home | _Sidebar