VBoxManage: error: Failed to create the host-only adapter VBoxManage: error: VBoxNetAdpCtl: Error while adding new interface: failed to open

After configuring some network settings as given below, I got the following error. I have mentioned how I resolved it here.

master.vm.network :private_network, ip: "33.33.33.10"
Vagrant up or Vagrant reload command

Error:

There was an error while executing `VBoxManage`, a CLI used by Vagrant
for controlling VirtualBox. The command and stderr is shown below.

Command: ["hostonlyif", "create"]

Stderr: 0%...
Progress state: NS_ERROR_FAILURE
VBoxManage: error: Failed to create the host-only adapter
VBoxManage: error: VBoxNetAdpCtl: Error while adding new interface: failed to open /dev/vboxnetctl: No such file or directory

VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component HostNetworkInterface, interface IHostNetworkInterface
VBoxManage: error: Context: "int handleCreate(HandlerArg*, int, int*)" at line 68 of file VBoxManageHostonly.cpp

Solution:

1. First power off all the VMs running in virtual box
2. Then run the following command: (For Mac)

sudo /Library/StartupItems/VirtualBox/VirtualBox restart

1. Then start required VMs