ERR_NGROK_5400: Event Sources for the "TYP" event type must specify fields to capture

What does ERR_NGROK_5400 mean?

ngrok returns ERR_NGROK_5400 with this message:

Event Sources for the "<TYP>" event type must specify fields to capture.

Troubleshoot ERR_NGROK_5400 with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

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