The configured data directory /var/ceemesdata/wvg-live/
is not a writable directory, or it doesn't exist at all.
If this is the correct path, create the directory now and/or set the correct permissions
(see your local installation specs - most probably it's chmod 2770, i.e. setgid)
and make sure that the script user can reach it. If not, adjust $CONFIG['prefix']
in your config file accordingly.