Traefik suddenly stopped working: "command traefik error: field not found, node: redirect"

Ubuntu 18.04 LTS,

My Traefik container stopped working seemingly out of nowhere and I don't know where to look. Here's the log:

command traefik error: field not found, node: redirect

Over and over. How can I begin to troubleshoot this?

Duplicate of "command traefik error: field not found, node: redirect"

Thank you. I had googled it but neglected to search this forum! Fixed