Url https://<venusIP>/gui_v2 shows Error "404 Not Found"

Hi Community, I am running 3.54 on my rPi4 a few weeks without problems, but today I received an Error 404.
looked into the filesystem and found /var/www/venus/gui-beta, url https:///gui_beta is working.
Any idea what I possibly did with my VenusOS?
Thanks in advance
Leopold

try either <venus.local> or in the browser…

Already tried “venus.local”,“venus-2.local” and ipaddress → same problem ,
//<…>/gui-v1 is working