E: Type '--2016-05-25' is not known on line 1 in source list /etc/apt/sources.list.d/playonlinux.list
E: The list of sources could not be read.

sudo bash -c 'echo "deb http://deb.playonlinux.com/ $(lsb_release -cs) main" > /etc/apt/sources.list.d/playonlinux.list'
sudo apt-get update