glib.GError: Icon 'gtk-cdrom' not present in theme

STR:
1) Open arista
2) Click "Create Conversion"

What happens:
No visual change in the app. stdout contains:

lfaraone@argon:~$ arista-gtk
Traceback (most recent call last):
  File "/usr/bin/arista-gtk", line 514, in on_add
    self.add_dialog = AddDialog(self, selected_preset)
  File "/usr/bin/arista-gtk", line 1063, in __init__
    self.setup_source()
  File "/usr/bin/arista-gtk", line 1138, in setup_source
    model.set_value(iter, 0, theme.load_icon(icon, size, 0))
glib.GError: Icon 'gtk-cdrom' not present in theme

What should happen:

Anything else :P

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: arista 0.9.7-6
ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
Uname: Linux 3.19.0-18-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Jun 4 16:15:44 2015
ExecutablePath: /usr/share/arista/arista-gtk
InstallationDate: Installed on 2014-10-01 (246 days ago)
InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
SourcePackage: arista
UpgradeStatus: Upgraded to vivid on 2015-02-04 (119 days ago)