DockerToolbox 1.12.2 installation failing on Mac OS X EI Capitan (version 10.11.6)

While installing I am getting following errors.

Running pre-create checks…
(default) Default Boot2Docker ISO is out-of-date, downloading the latest release…
(default) Latest release for github.com/boot2docker/boot2docker is v1.12.3
(default) Downloading /Users/ktyagi/.docker/machine/cache/boot2docker.iso from https://github.com/boot2docker/boot2docker/releases/download/v1.12.3/boot2docker.iso
(default) 0%…10%…20%…30%…40%…50%…60%…70%…80%…90%…100%
Creating machine…
(default) Copying /Users/ktyagi/.docker/machine/cache/boot2docker.iso to /Users/ktyagi/.docker/machine/machines/default/boot2docker.iso…
(default) Creating VirtualBox VM…
(default) Creating SSH key…
(default) Starting the VM…
(default) Check network to re-create if needed…
Error creating machine: Error in driver during machine creation: Unable to start the VM: /usr/local/bin/VBoxManage startvm default --type headless failed:
VBoxManage: error: The VM session was aborted
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component SessionMachine, interface ISession

Details: 00:00:00.157045 NAT: Guest address guess set to 10.0.2.15 by initialization
Starting “default”…
(default) Check network to re-create if needed…
Unable to start the VM: /usr/local/bin/VBoxManage startvm default --type headless failed:
VBoxManage: error: The VM session was aborted
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component SessionMachine, interface ISession

Details: 00:00:00.160579 NAT: Guest address guess set to 10.0.2.15 by initialization
Regenerate TLS machine certs? Warning: this is irreversible. (y/n): Regenerating TLS certificates
Waiting for SSH to be available…
Password:
Password:
Password: