The following settings shouldn't exist: max_tries

following these instructions:

Install system dependencies: Drush, Vagrant, VirtualBox and, optionally, an NFS-server (ref.)
Install Drush dependencies (Drush Vagrant Integration and Drush Hosts): drush dl drush-vagrant drush-hosts (ref.)
Install Aegir-up: drush dl aegir-up
Build a new project: drush vagrant-build --blueprint=aegir
Respond to prompts for additional information required to build your project
Wait while the Vagrant base box is downloaded (this will take a few minutes, but is only required once)

I fail there at step five with this error:

The following settings shouldn't exist: max_tries

This looks to be the same issue here:

https://drupal.org/node/2093105

But they seem to think it was fixed and closed the issue the 17th of October last year. I'd edit the VagrantFile but I'm not even sure where it is at this point as there is no directory built in my current working directory when I incant those commands. Any clue where that file lives so I might edit it? Or is there a fix already that I should be using instead?

here's my full output if anyone wants it:

drush vagrant-build --blueprint=aegir
The name of your project may be used in URLs, and so should only contain lower-case letters and numbers.
It may also contain hyphens (-) and dots (.), so long as they do not come at the beginning or end of the name.
What would you like to call your project?: aegirup
Would you like to generate entries in /etc/hosts for the VMs in your project? (y/n): y
You are about to:
  * Create a new project called "aegirup" at "/home/bob/vagrant/projects/aegirup".
  * Add entries for the FQDNs of the VMs to /etc/hosts. (You will be prompted for your sudo password.)
  * Generate Drush aliases for the project and VMs.
  * Launch the project VMs immediately.
  * Build the project using the "aegir" blueprint from the "aegirup" extension.
Do you want to proceed with initializing the project? (y/n): y
Copied the "aegir" blueprint directory to /home/bob/vagrant/projects/aegirup.                                                                                                                             [ok]
Created symlink to Vagrantfile.                                                                                                                                                                           [ok]
Created symlink to .gitignore.                                                                                                                                                                            [ok]
Created the ".config" directory in /home/bob/vagrant/projects/aegirup.                                                                                                                                    [ok]
Wrote "blueprint.inc" to /home/bob/vagrant/projects/aegirup/.config.                                                                                                                                      [ok]
Successfully wrote config.rb                                                                                                                                                                              [ok]
Copied your .profile into the project                                                                                                                                                                     [ok]
Copied your .bashrc into the project                                                                                                                                                                      [ok]
Copied your .vimrc into the project                                                                                                                                                                       [ok]
Initialized empty Git repository in /mnt/quake/vagrant/projects/aegirup/.git/
[master (root-commit) 23005c2] Initial commit.
 Committer: bob <bob@MSIGS70stealth.thalhalla.net>
Your name and email address were configured automatically based
on your username and hostname. Please check that they are accurate.
You can suppress this message by setting them explicitly:

    git config --global user.name "Your Name"
    git config --global user.email you@example.com

After doing this, you may fix the identity used for this commit with:

    git commit --amend --reset-author

 3 files changed, 22 insertions(+)
 create mode 100644 manifests/nodes.pp
 create mode 100644 manifests/site.pp
 create mode 100644 settings.rb
Bringing machine 'aegir-up' up with 'virtualbox' provider...
There are errors in the configuration of this machine. Please fix
the following errors and try again:

SSH:
* The following settings shouldn't exist: max_tries


The following errors occurred when running "vagrant up":                                                                                                                                                  [error]
agilation
Drush command terminated abnormally due to an unrecoverable error.