gdebi-gtk crashed with KeyError in __getitem__(): "The cache has no package named 'airtime'"

[Nicolas DERIVE]

Trying to install a .deb downloaded from airtime project using gdebi.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: gdebi 0.8~exp2
ProcVersionSignature: Ubuntu 3.0-2.3-generic-pae 3.0.0-rc4
Uname: Linux 3.0-2-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
CheckboxSubmission: c4273c0f4f2b8d26cd6bf31cadfd2912
CheckboxSystem: a871981cb5bdf4d6ebd55be46becf77e
Date: Sat Jul 2 16:42:28 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/share/gdebi/gdebi-gtk
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/gdebi-gtk /home/username/Bureau/airtime_1.7.0-2_all.deb
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 LANGUAGE=fr_FR:fr:en_GB:en
PythonArgs: ['/usr/bin/gdebi-gtk', '/home/username/Bureau/airtime_1.7.0-2_all.deb']
SourcePackage: gdebi
Title: gdebi-gtk crashed with KeyError in __getitem__(): "The cache has no package named 'airtime'"
UpgradeStatus: Upgraded to oneiric on 2008-10-18 (987 days ago)
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