Failed Install Veil Evasion on Kali Linux/and Rolling

when i tried to install veil-evasion everything went right except the last line cant download go they say i have to copy something to the file /etc/apt (source file) i dont know what i looked on google but nothing worked i dont know what to do pls help who understands...

i copied this:

cat << EOF > /etc/apt/sources.list

deb http://http.kali.org/kali kali-rolling main non-free contrib

EOF

from this website:

https://www.kali.org/news/kali-linux-rolling-edition-2016-1/

thankx for the helpers