start-schooltool-instance crashed with SystemError in /usr/lib/python2.7/dist-packages/zope/security/checker.py: dynamic module not initialized properly

[Cristian Aravena Romero]

Install proposed and remove proposed: http://www.webupd8.org/2013/11/how-to-downgrade-proposed-repository.html

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: python-schooltool 1:2.6.4-0ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-5.10-generic 3.16.0-rc6
Uname: Linux 3.16.0-5-generic x86_64
ApportVersion: 2.14.4-0ubuntu2
Architecture: amd64
CrashCounter: 1
Date: Thu Jul 24 00:37:18 2014
ExecutablePath: /usr/bin/start-schooltool-instance
InstallationDate: Installed on 2014-04-27 (88 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/start-schooltool-instance /etc/schooltool/standard
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
PythonArgs: ['/usr/bin/start-schooltool-instance', '/etc/schooltool/standard']
SourcePackage: schooltool
Title: start-schooltool-instance crashed with SystemError in /usr/lib/python2.7/dist-packages/zope/security/checker.py: dynamic module not initialized properly
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: