I just renamed a variable that was displayed on one of my dashboards, and I received this error:
The variable tile disappeared from my dashboard, but when I went to add new tile it still showed occupying the space where it previously appeared. I tried removing the renamed variable from the app, saving the app, and then opening and adding the variable tile again. It appeared as a variable option to create a tile, but when I tried, it still wouldn't show on the dashboard. I rebooted the hub, after which the tiles with the renamed variable appeared. But now, I have multiple tiles for this variable and they won't delete. I receive the "delete" confirmation, and the dashboard refreshes, but they are still visible.
EDIT: The variable tiles have disappeared again, and I am unable to add the variable tile back. But the dashboard continues to show that the spaces (now 3) are occupied by these invisible tiles. Rebuilding this dashboard from scratch is not an option since it's quite complex and would take me HOURS.