Error Code Reference

Complete reference of LumenFlow error codes with causes and resolutions.

Error code format#

LumenFlow errors follow the format EXXXX with a human-readable message and additional context for debugging.

Code	Message	Resolution
`E001`	Invalid API key	Check your workspace token in Settings
`E002`	Token expired	Generate a new token
`E003`	Insufficient scope	Request the needed scope when creating the token
`E004`	Session expired	Sign in again

Code	Message	Resolution
`E010`	Provider unavailable	Check your LLM provider's status page
`E011`	Invalid provider key	Verify your API key with the provider
`E012`	Provider rate limited	Wait and retry; consider a different model
`E013`	Model not available	Choose a different model in settings

Code	Message	Resolution
`E020`	Action blocked by rule	Review governance rules in settings
`E021`	Approval required	Approve the pending proposal
`E022`	Escalation needed	Route to the designated approver
`E023`	Policy conflict	Two rules conflict — adjust priorities

Code	Message	Resolution
`E030`	Budget exceeded	Increase budget or wait for reset
`E031`	Per-action limit exceeded	Simplify the request or raise the limit
`E032`	Daily action limit reached	Wait until tomorrow or raise the limit

Code	Message	Resolution
`E040`	Connection not found	Add the connection in settings
`E041`	Connection expired	Reconnect via OAuth
`E042`	Insufficient permissions	Re-authorize with required scopes
`E043`	Service unreachable	Check the external service's status

success Include the error code and details field when contacting support. This helps us diagnose issues quickly.