On Mac:

which virtualbox 
sudo PATH/VirtualBox restart

Edit: Previous solution assumes that VirtualBox is started with the system while following is more generic:

which virtualbox 
sudo "PATH//VirtualBoxStartup.sh" restart
 
Solution 2: 
 
Downgrade or upgrade the version of VirtualBox to 6.1.16, this version is a stable fully functional version of virtualbox
 
 
Done!!
Submitted 3 years 4 months ago by ddkits-admin.