Error: Driver 'pcspkr' is already registered, aborting...

Just to followup, login to the command line as root via console or SSH and run this single line of code to remove that error message:
Code:
# echo "blacklist pcspkr" > /etc/modprobe.d/blacklist-pcspkr.conf

This worked for me on PVE 5.1
 
Quien me puede ayudar ?? mi servidor proxmox 4.4 me pone este mensaje de error y no me deja iniciar las máquinas virtuales que tengo dentro.

[14.349882] Error: el controlador 'pcspkr' ya está registrado, abortando ...