error when using with nextcloud

[syswombat]

Hello
what did i wrong? from nextcloud contact addressbock.
have a nice day

Retrieving VCards from all CardDAV server(s):
[0]: http://nextcloud.kozo.ch/remote.php/dav/addressbooks/users/vincent/Fritzphone/ PHP Fatal error: Uncaught Exception: Woops, something's gone wrong! The CardDAV server returned the http status code 401. in /root/carddav2fb/lib/CardDAV-PHP/carddav.php:349
Stack trace:
#0 /root/carddav2fb/carddav2fb.php(217): CardDavPHP\CardDavBackend->get()
#1 /root/carddav2fb/carddav2fb.php(79): CardDAV2FB->get_carddav_entries()
#2 {main}
thrown in /root/carddav2fb/lib/CardDAV-PHP/carddav.php on line 349

[carlos22]

I think your credentials are wrong? 401 means you are not authenticated: https://en.wikipedia.org/wiki/List_of_HTTP_status_codes#4xx_Client_errors