ERR_NGROK_SHIP_BUILD_CONFIG_PATH_NOT_ALLOWED: The FIELD value VALUE leaves the repository - ngrok documentation

What does ERR_NGROK_SHIP_BUILD_CONFIG_PATH_NOT_ALLOWED mean?

ngrok returns ERR_NGROK_SHIP_BUILD_CONFIG_PATH_NOT_ALLOWED with this message:

The <FIELD> value <VALUE> leaves the repository. '..' segments are not allowed.

Where can I get more help with ERR_NGROK_SHIP_BUILD_CONFIG_PATH_NOT_ALLOWED?

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