Error when trying vagrant up

I'm using Vagrant for my environment and I've got a little issue:

$vagrant up

Bringing machine 'default' up with 'virtualbox' provider...
==> default: Box 'base' could not be found. Attempting to find and install...
    default: Box Provider: virtualbox
    default: Box Version: >= 0
==> default: Adding box 'base' (v0) for provider: virtualbox
    default: Downloading: base

An error occurred while downloading the remote file. The error
message, if any, is reproduced below. Please fix this error and try
again.

Couldn't open file /Users/.../base

I have initialised my project with vagrant init but for some reason vagrant up refuses to work.

It looks like you may have created a Vagrant project with just vagrant init. That will create your Vagrantfile, but it won't have a box defined.

Instead, you could try

$ vagrant init hashicorp/precise32
$ vagrant up

which uses a standard Ubuntu image. The Vagrant website has a Getting Started which gives some good examples.

If you're using OS X and used the standard install, Delete vagrant's old curl and it should now work

sudo rm /opt/vagrant/embedded/bin/curl