ERR_NGROK_SHIP_SCHEDULING_POLICY_INVALID: The 'scheduling_policy' expression fails to compile: REASON - ngrok documentation

What does ERR_NGROK_SHIP_SCHEDULING_POLICY_INVALID mean?

ngrok returns ERR_NGROK_SHIP_SCHEDULING_POLICY_INVALID with this message:

The 'scheduling_policy' expression fails to compile: <REASON>

Where can I get more help with ERR_NGROK_SHIP_SCHEDULING_POLICY_INVALID?

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