When the : "Error: Driver 'pcspkr' is already registered" will appear in Virtual Machine?

On Virtual machine's, if you are observing following message 'Error: Driver 'pcspkr' is already registered'  in /var/log/messages file, then we get rid of this by adding  'blacklist snd-pcsp' in /etc/modeprobe.d/blacklist.conf file.

#echo 'blacklist snd-pcsp' >> /etc/modprobe.d/blacklist.conf