Website throwing "Updating. We will be back in a few moments..." but bench starts without error

I can successfully do a bench start but trying get into my main site (frappe / erpnext) from the web throws this error. It does not happen if I change my default site to another app.

This message happened following some mistake I made trying to manually remove an experimental app/site:

  1. I manually removed the directories for the app and site and was no longer able to do bench start because of a complaint regarding the missing app.
  2. I modified a small number of files that list apps and specifically deleted the line referring to offending app.

bench start seems to think everything is fine even though the user cannot get in to the website. Are there any logs or any suggestions about how I can resolve this problem?

Just run bench frappe --latest all and it should work again

Thank you that worked - issue closed.