Issue after update 2 days ago

Hi, I updated to latest version via Webinterface Home Assistant running on Rasp 4 under Hassio. Today I realised that Im not able to reach webinterface anymore. I startet new with Monitor and I can logon via root to HassIO. Core Log tells me a "ModuleNotFoundError: No module named idna´
Core Start tells me Error: Unknown error, see Supervisor.

Does anybody has an idea how to fix it?

Thanks Michael