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err:unkey:application:deployment_not_stopped
You asked to start a deployment that isn’t stopped. You get HTTP 412.
Example response

Likely causes

  • The deployment is already running.
  • The deployment is still building.
  • The deployment failed.
A deployment that’s still shutting down after a stop counts as stopped, so you can start it right away.

How to fix

  1. Read the deployment with deployments.getDeployment. start is in its availableActions only when the call would succeed.
  2. If it’s already running, there’s nothing to do.
  3. If it never became ready, create a new deployment instead.
Last modified on October 6, 2026