Can't start Korganizer after upgrading kde 4.1 RC

[김명성]

I just updated kubuntu with apt-get and then I can't start korganizer.
Below messages are log for running korganizer.
Anyone can help me?

==========================================================================================
funcrush at 2zii:~$ korganizer
korganizer(6767): ""LastLoad" - conversion of "-4713,1,1,0,0,0" to QDateTime
failed"
korganizer(6767): ""LastSave" - conversion of "-4713,1,1,0,0,0" to QDateTime
failed"
KTranscript: Loaded module:
/usr/lib/kde4/share/locale/ko/LC_SCRIPTS/kdelibs4/kdelibs4.js
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = korganizer path = <unknown> pid = 6767
sock_file=/home/funcrush/.kde4/socket-2zii/kdeinit4__0
<unknown program name>(6766)/: Communication problem with  "korganizer" , it
probably crashed.
Error message was:  "org.freedesktop.DBus.Error.NoReply" : " "Message did
not receive a reply (timeout by message bus)" "
==========================================================================================
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