Mopidy Webinterface does not work

I tried to install a mopidy-webinterface but if I go to http://192.168.64.91:6600/musicbox_webclient it gives me the following text in the browser:
OK MPD 0.17.0
ACK [5@0] {None} Invalid word character
ACK [5@0] {None} Invalid word character
ACK [5@0] {None} Invalid word character
ACK [5@0] {None} Invalid word character
ACK [5@0] {None} Invalid word character
ACK [5@0] {None} Invalid word character
ACK [5@0] {None} Invalid word character
ACK [5@0] {None} Invalid word character
ACK [5@0] {} No command given
I run mopidy on a raspberry pi 2 with Mopidy-MusicBox-Webclient and Spotify Extension.

Port 6600 is for the MPD protocol, you want port 6680.

Thank you works perfectly.