Error with Icloud connection

Quite suddenly, my (previously working) iCloud thing is now showing this error: iCloud response invalid: null

I manually logged into iCloud with the same credentials, it works fine. I made no changes to my OpenHAB configuration or my RPi. I tried rebooting the RPi, disabling/re-enabling the thing, both to no avail. I’m not sure as to next steps and given my history of messing things up by doing fixes . I thought it best to start here. Any suggestions? Everything else is working fine.

Thank you, in advance.

Please use the forum search, this has alredy been reported many times.
Also an issue on github has been filed.
It seems that Apple changed something causing this error.