@mihairosu Just disable it in sources.list on your hardware. Phil has said they wont be servicing from this repo anymore.
comment out the line
someuser@mangoES1234:~$ sudo nano /etc/apt/sources.list
deb http://ftp.debian.org/debian jessie main contrib non-free
deb-src http://ftp.debian.org/debian jessie main contrib non-free
deb http://security.debian.org/debian-security jessie/updates main contrib non-$
deb-src http://security.debian.org/debian-security jessie/updates main contrib $
//add # before the next line
#deb http://mangoautomation.net:9902/Applications/apt/debian/ jessie main contr$
#deb ....
#deb....