xbian rpi3, latest image: udate error

[picard12]

Hello,
I tried to update it with the repository shown below I have an error

Terminal

deb http://http.debian.net/debian jessie main non-free

error:

Terminal

Duplicate sources.list entry mirror://apt.xbian.org/mirror.txt/ stable/rpi2-jessie armhf Packages (/var/lib/apt/lists/apt.xbian.org_mirror.txt_dists_stable_rpi2-jessie_binary-armhf_Packages)
W: You may want to run apt-get update to correct these problems

thanks for helps