"Ocurrió un error al crear el elemento GStreamer; compruebe su instalación"

i cant play sound files in my box, because of this message when clicking in the "play" button.

translated into English: "Error when creating Gstreamer item; Check gstreamer installation"

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: libgstreamer0.10-0 0.10.36-1ubuntu2
ProcVersionSignature: Ubuntu 3.7.0-7.15-generic 3.7.0
Uname: Linux 3.7.0-7-generic x86_64
ApportVersion: 2.7-0ubuntu2
Architecture: amd64
Date: Fri Dec 28 16:42:50 2012
InstallationDate: Installed on 2012-03-07 (295 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MarkForUpload: True
SourcePackage: gstreamer0.10
UpgradeStatus: Upgraded to raring on 2012-12-27 (0 days ago)