During the boot process it now finds the iso file. I initially had
an
error in the menu entry.
Great.
When it tries to mount the iso the error line is:
mount: /run/install/isodir/Fedora-Server-netinst-i386-23_Alpha failed to
setup loop device: no such file or directory.
Try a shorter file name. The .iso suffix is chopped in your error message.
Maybe also try removing the kickstart file definition from the config for now, just to
make sure it does not affect it somehow.
And then displays the error /dev/root does not exist.
That just says "I couldn't find any partition to mount as the root
filesystem" (and /dev/root is probably the default value). The root partition is in
that iso file, but it failed to mount, so there's none. This error message is a direct
consequence of the previous one.