Hello @alltej , is there a chance you attempted to update a dashboard that someone else had updated and you somehow didn’t have the most recent version? I think this is pretty well handled by Quicksight but I suppose it could be a possibility. You could attempt to create a fresh analysis off of the published dashboard, make those changes again, and attempt to publish it again.
If you continue having issues, I saw this other question in the community that was similar and Peter suggested logging a ticket with the technical team to debug the issue. That could be a useful path if you continue to experience this error.