If you are using a recent version, then Grafana checks to see if someone else has saved changes to the dashboard you are working on. If yes, then it displays the message so that you can either choose to override their changes with yours or not.
I’m not getting that confirmation message. It just randomly gives the error, even when I haven’t made changes. It’s very hard to deal with since I’m trying to load some new panels and most of the time it won’t let me submit JSON Model changes.
I met the same problem with Grafana v7.3.5 (11f305f88a) when copying the dashboard JSON from one Grafana to another, resolved with the following steps:
keep the dashboard id the same or null
keep the dashboard uid the same or null
After saving changes, you can find a new loaded dashboard in the dashboard list
Had the same issue where it only happened with the dashboard JSON. Fixed mine by recopying the JSON from the dashboard, editing it and pasting it back in.