Save Failed - unable to save changes on a dashboard

We are running Metabase version 0.42.4. We recently deployed metabase to a new server but maintained the database. Since then, I have been unable to save new changes on Dashboards that I had created before, all I keep getting is ' Saving failed '. Its definitely not permission as I still hold the same admin status as before.

Hi, do you know if you are using a proxy?

See if this troubleshooting guide helps:
Can't save questions or dashboards.