Error with vagrant while using vagrant up on terminal

I was going through a course on udacity "Linux Command Line Basics." , the course requirement is to install VirtualBox and vagrant for virtual linux environment, after installation, next step is to use "vagrant up" command on terminal, for which i got error :-

  Nitins-Air:Shell nitintushir$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Box 'ubuntu/trusty64' could not be found. Attempting to find and install...
    default: Box Provider: virtualbox
    default: Box Version: >= 0
==> default: Loading metadata for box 'ubuntu/trusty64'
    default: URL: https://vagrantcloud.com/ubuntu/trusty64
==> default: Adding box 'ubuntu/trusty64' (v20190429.0.1) for provider: virtualbox
    default: Downloading: https://vagrantcloud.com/ubuntu/boxes/trusty64/versions/20190429.0.1/providers/virtualbox.box
==> default: Box download is resuming from prior download progress
    default: Download redirected to host: cloud-images.ubuntu.com
==> default: Successfully added box 'ubuntu/trusty64' (v20190429.0.1) for 'virtualbox'!
==> default: Importing base box 'ubuntu/trusty64'...
==> default: Matching MAC address for NAT networking...
==> default: Checking if box 'ubuntu/trusty64' version '20190429.0.1' is up to date...
==> default: Setting the name of the VM: Shell_default_1569492301228_35998
==> default: Clearing any previously set forwarded ports...
Vagrant is currently configured to create VirtualBox synced folders with
the `SharedFoldersEnableSymlinksCreate` option enabled. If the Vagrant
guest is not trusted, you may want to disable this option. For more
information on this option, please refer to the VirtualBox manual:

  https://www.virtualbox.org/manual/ch04.html#sharedfolders

This option can be disabled globally with an environment variable:

  VAGRANT_DISABLE_VBOXSYMLINKCREATE=1

or on a per folder basis within the Vagrantfile:

  config.vm.synced_folder '/host/path', '/guest/path', SharedFoldersEnableSymlinksCreate: false
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
==> default: Forwarding ports...
    default: 22 (guest) => 2222 (host) (adapter 1)
==> default: Booting VM...




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

Command: ["startvm", "6af71892-ad18-44e8-a10d-8b8da23a7e80", "--type", "headless"]

Stderr: VBoxManage: error: The virtual machine 'Shell_default_1569492301228_35998' has terminated unexpectedly during startup with exit code 1 (0x1)
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component MachineWrap, interface IMachine

What could be the possible solution to run this command successfully ?