404 Not Found when starts panamax

[eungjun-yi]

I tried to install panamax on arch linux but an error occured when starts panamax as follows:

CenturyLink Labs - http://www.centurylinklabs.com/
 1) init:          First time installing Panamax! - Downloads CoreOS VM and installs latest Panamax version.
 2) pause:         Stops Panamax
 3) up:            Starts Panamax
 4) restart:       Stops and Starts Panamax.
 5) reinstall:     Deletes your applications and CoreOS VM; reinstalls to latest Panamax version.
 6) info:          Displays version of your local panamax install.
 7) check:         Checks for available updates for Panamax.
 8) download:      Updates to latest Panamax version.
 9) delete:        Uninstalls Panamax, deletes applications and CoreOS VM.
10) ssh:           SSH into Panamax CoreOS VM.
11) help:          Show this help
12) debug:         Display your current Panamax settings.
13) quit
Please select one of the preceding options: 3

Checking if required software is installed.

Vagrant 1.6 or newer installed.
Virtualbox 4.3 or newer installed.

Starting Panamax
Bringing machine 'panamax-vm' up with 'virtualbox' provider...
==> panamax-vm: Box 'panamax-coreos-box-522.6.0' could not be found. Attempting to find and install...
    panamax-vm: Box Provider: virtualbox
    panamax-vm: Box Version: >= 0
==> panamax-vm: Box file was not detected as metadata. Adding it directly...
==> panamax-vm: Adding box 'panamax-coreos-box-522.6.0' (v0) for provider: virtualbox
    panamax-vm: Downloading: http://storage.core-os.net/coreos/amd64-usr/522.6.0/coreos_production_vagrant.box
An error occurred while downloading the remote file. The error
message, if any, is reproduced below. Please fix this error and try
again.

The requested URL returned error: 404 Not Found
Starting Panamax seems to have failed. Please try again or use reinstall option.