Fails to create a new Docker machine

I am trying to run these commands to create a new Docker machine:

docker-machine create --driver virtualbox mymachine
docker-machine restart mymachine
eval "$(docker-machine env mymachine)"

However, I keep getting this error:

(dockered) Creating a new host-only adapter produced an error: /usr/local/bin/VBoxManage hostonlyif create failed:
(dockered) 0%...
(dockered) Progress state: NS_ERROR_FAILURE
(dockered) VBoxManage: error: Failed to create the host-only adapter
(dockered) VBoxManage: error: VBoxNetAdpCtl: Error while adding new interface: failed to open /dev/vboxnetctl: No such file or directory
(dockered) VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component HostNetworkInterfaceWrap, interface IHostNetworkInterface
(dockered) VBoxManage: error: Context: "RTEXITCODE handleCreate(HandlerArg *)" at line 94 of file VBoxManageHostonly.cpp
(dockered)
(dockered) This is a known VirtualBox bug. Let's try to recover anyway...

I have uninstalled and reinstalled both Docker and VirtualBox to try and fix this as per other StackOverflow questions, but nothing works. Please let me know how to fix this?