Have tried everything. VLC no longer opens via GUI. Once I did get the dvd to play in VLC by opening it from terminal. I can only open from terminal now. This is what it says:
gabriel@gabriel-SVE1511RFXB:~$ vlc
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80)
[0000000000732148] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
Gtk-Message: Failed to load module "pantheon-filechooser-module"
(vlc:20300): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(vlc:20300): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(vlc:20300): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(vlc:20300): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
libdvdnav: Using dvdnav version 5.0.3
libdvdread: Could not open /dev/sr0 with libdvdcss.
libdvdread: Can't open /dev/sr0 for reading
libdvdnav: vm: failed to open/read the DVD
libdvdread: Could not open /dev/sr0 with libdvdcss.
libdvdread: Can't open /dev/sr0 for reading
[00007f53c4000e98] dvdread demux error: DVDRead cannot open source: /dev/sr0
[00007f53dc0009b8] core input error: open of `dvd:///dev/sr0' failed