Grafana Re-install issue

I was installing Grafana for the first time and had a power-fail at the house. When the power cam back on HA on the pi started back up OK and I uninstalled Grafana because it did not complete it’s install. I have now attempted to re-install Grfana. Is fails with the following error message in the HA log file. Can anybody advise me how to fix this please. I know basis Debian commands.

ERROR (SyncWorker_10) [supervisor.docker.interface] Can’t install hassioaddons/grafana-armv7:4.2.1 -> 500 Server Error: Internal Server Error (“readlink /mnt/data/docker/overlay2: invalid argument”).

thanks in advance…