Vagrant has created a new VM in place of the existing one. How to return?

Question

IDE

I used vagrant for one project.
But at some point I created several virtual machines.
And everything configured and installed for the project was in the first. And by vagrant up, the last one created is completely empty. I don't want to reinstall everything.
How to return to the original?
Tried in Vagrantfile:
config.vm.provider "virtualbox" do |vb|
vb.name = "Vagrant_default_1412683999581_91987"
end
but then it says
A VirtualBox machine with the name 'Vagrant_default_1412683999581_91987' already
exists.
Please use another name or delete the machine with the existing
name, and try again.