Unable to update Supervisor: 404 Client Error: Not Found

I get the following error message in the logs when trying to update Hass.io, but I’m not sure why - can anyone advise why this may occur and what I could do to troubleshoot? I’m running Hass.io from a RPi (v1):

17-10-03 08:50:53 INFO (MainThread) [hassio.tasks] Found new HassIO version 0.67.
17-10-03 08:50:53 INFO (MainThread) [hassio.dock.supervisor] Update supervisor docker to homeassistant/armhf-hassio-supervisor:0.67
17-10-03 08:50:53 INFO (SyncWorker_1) [hassio.dock.interface] Pull image homeassistant/armhf-hassio-supervisor tag 0.67.
17-10-03 08:52:06 ERROR (SyncWorker_1) [hassio.dock.interface] Can't install homeassistant/armhf-hassio-supervisor:0.67 -> 404 Client Error: Not Found ("no such image: homeassistant/armhf-hassio-supervisor:0.67: No such image: homeassistant/armhf-hassio-supervisor:0.67").

I have an extremely similar issue, but when trying to pull the homebridge add on.

I wonder if they are related, and it’s a HassIO bug?

17-10-03 13:13:28 INFO (MainThread) [hassio.updater] Fetch update data from https://raw.githubusercontent.com/home-assistant/hassio/master/version.json
17-10-03 14:41:22 INFO (SyncWorker_14) [hassio.dock.interface] Pull image hassioaddons/homebridge-armhf tag 1.0.3.
17-10-03 14:41:25 ERROR (SyncWorker_14) [hassio.dock.interface] Can't install hassioaddons/homebridge-armhf:1.0.3 -> 404 Client Error: Not Found ("no such image: hassioaddons/homebridge-armhf:1.0.3: No such image: hassioaddons/homebridge-armhf:1.0.3").

I’ve ended up removing HASS.io and going to just HA, but I did read later on that it may be a problem with not enough free space - so worth checking to see if that helps :).

I am having the same issue with 0.74 supervisor.

Can anyone tell me how to clean up or extend the docker disk space ( I have 400Gb free on the hardware )