Radicale: Service Unavailable

[Flo <debianflo@gmx.at>]

Dear All,

I want to set up Radicale for syncing via CardDav and CalDav.

I set up Apache and want to access Radicale with uwsgi. When I enter the 
user name it says 'Service Unavailable'.

The error logfile shows:
[proxy:error] [pid 21029:tid 140292405581568] (111)Connection refused: 
AH02454: uwsgi: attempt to connect to Unix domain socket 
/run/uwsgi/app/radicale/socket (radicale) failed
[:error] [pid 21029:tid 140292405581568] [client 178.251.71.190:33788] 
AH10101: failed to make connection to backend: httpd-UDS:0

I am running buster. Https traffic seems to work, I get asked for 
username/password.

I took examples/apache2-vhost.conf and just edited the domain/host name 
and corrected the conf-available file to radicale-uwsgi.conf (bug) and 
put it into /etc/apache2/sites-available (+ a2ensite ...).

I also edited /etc/radicale/config but for me it looks like that it's 
not coming that far.

I have never worked with sockets so far, so I am a bit lost now. Can 
anyone give me some hints?

Thank you,
Flo.