ERR_NGROK_2237: Invalid configuration for ACTION: CONFIG length of ACTUAL does not satisfy minimum length of MIN - ngrok documentation

What does ERR_NGROK_2237 mean?

ngrok returns ERR_NGROK_2237 with this message:

Invalid configuration for <ACTION>: <CONFIG> length of <ACTUAL> does not satisfy minimum length of <MIN>.

Where can I get more help with ERR_NGROK_2237?

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