<type 'exceptions.UnicodeDecodeError'>: 'ascii' codec can't decode byte 0xe6 in position 0: ordinal not in range(128)

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Binary package hint: aptdaemon

It happened when I was removing softwares in software center

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: aptdaemon 0.41+bzr604-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
Annotation: Removing software failed
Architecture: i386
Date: Sun Apr 3 22:29:59 2011
DesktopFile: /usr/share/aptdaemon/aptdaemon.desktop
ExecutablePath: /usr/sbin/aptd
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
SourcePackage: aptdaemon
Title: <type 'exceptions.UnicodeDecodeError'>: 'ascii' codec can't decode byte 0xe6 in position 0: ordinal not in range(128)
TransactionDepends: [[], [], [], [], [], [], []]
TransactionErrorCode: error-unknown
TransactionKwargs: {}
TransactionLocale: zh_CN.UTF8
TransactionOutput:

TransactionPackages: [[], [], [dbus.String(u'transmission-gtk')], [], [], []]
TransactionRole: role-remove-packages
UpgradeStatus: No upgrade log present (probably fresh install)