add-apt-repository crashed with ValueError in raw_decode(): No JSON object could be decoded

[JoseLuisTriana]

I just open a new sessión, then apport gives me the annoying message that something went wrong with software-properties. And that's it.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: python-software-properties 0.81.13.3
ProcVersionSignature: Ubuntu 3.0.0-15.26-generic 3.0.13
Uname: Linux 3.0.0-15-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Fri Feb 10 15:08:39 2012
ExecutablePath: /usr/bin/add-apt-repository
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/add-apt-repository ppa:merliwiz79/cinnamon-ppa
PythonArgs: ['/usr/bin/add-apt-repository', 'ppa:merliwiz79/cinnamon-ppa']
SourcePackage: software-properties
Title: add-apt-repository crashed with ValueError in raw_decode(): No JSON object could be decoded
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #861258, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.