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.