idle-python2.7 crashed with TclError in __init__(): couldn't open "/usr/lib/python2.7/idlelib/Icons/idle_16.png": no such file or directory

After installing IDLE (for Python 2.7) in Ubuntu 14.04 Beta1, it won't start. Apparently, it's missing some icon file in /usr/lib/python2.7/idlelib/Icons/

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: idle-python2.7 2.7.6-7
ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
Uname: Linux 3.13.0-16-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Mar 8 13:43:44 2014
ExecutablePath: /usr/bin/idle-python2.7
InstallationDate: Installed on 2014-03-02 (5 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140301)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python2.7 /usr/bin/idle-python2.7
PythonArgs: ['/usr/bin/idle-python2.7']
SourcePackage: python2.7
Title: idle-python2.7 crashed with TclError in __init__(): couldn't open "/usr/lib/python2.7/idlelib/Icons/idle_16.png": no such file or directory
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo