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VBoxManage: error: Failed to create the host-only adapter

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//" restart
Solution 2: 
Downgrade or upgrade the version of VirtualBox to 6.1.16, this version is a stable fully functional version of virtualbox