ERR_NGROK_SHIP_ENVIRONMENT_ROLLOUT_IN_PROGRESS: Environment ID already has a rollout in progress - ngrok documentation

What does ERR_NGROK_SHIP_ENVIRONMENT_ROLLOUT_IN_PROGRESS mean?

ngrok returns ERR_NGROK_SHIP_ENVIRONMENT_ROLLOUT_IN_PROGRESS with this message:

Environment <ID> already has a rollout in progress. Wait for it to finish.

Where can I get more help with ERR_NGROK_SHIP_ENVIRONMENT_ROLLOUT_IN_PROGRESS?

Email support@ngrok.com and include the error code.