Version:            (using KDE KDE 3.5.5)
Installed from:    Ubuntu Packages

before add external iCal i receive this error log :

(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1241752784 (LWP 8189)]
[New Thread -1282868320 (LWP 8193)]
[New Thread -1274475616 (LWP 8192)]
[New Thread -1266082912 (LWP 8191)]
[New Thread -1257690208 (LWP 8190)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)

(no debugging symbols found)
(no debugging symbols found)
[KCrash handler]
#6  0xb735df84 in QString::fromUtf8 () from /usr/lib/libqt-mt.so.3
#7  0xb667bc4d in KCal::Attachment::Attachment () from /usr/lib/libkcal.so.2
#8  0xb667bd2f in KCal::ICalFormatImpl::readAttachment ()
   from /usr/lib/libkcal.so.2
#9  0xb6693030 in KCal::ICalFormatImpl::readAlarm ()
   from /usr/lib/libkcal.so.2
#10 0xb66b52c6 in KCal::ICalFormatImpl::readIncidence ()
   from /usr/lib/libkcal.so.2
#11 0xb66b601b in KCal::ICalFormatImpl::readEvent ()
   from /usr/lib/libkcal.so.2
#12 0xb66b6ef9 in KCal::ICalFormatImpl::populate () from /usr/lib/libkcal.so.2
#13 0xb66b733a in KCal::ICalFormat::fromRawString ()
   from /usr/lib/libkcal.so.2
#14 0xb66b8270 in KCal::ICalFormat::load () from /usr/lib/libkcal.so.2
#15 0xb66b8333 in KCal::FileStorage::load () from /usr/lib/libkcal.so.2
#16 0xb66b8504 in KCal::CalendarLocal::load () from /usr/lib/libkcal.so.2
#17 0xb66b924c in KCal::ResourceCached::loadCache ()
   from /usr/lib/libkcal.so.2
#18 0xb2a1f770 in KCal::ResourceRemote::doLoad ()
   from /usr/lib/libkcal_resourceremote.so.1
#19 0xb668a09a in KCal::ResourceCalendar::load () from /usr/lib/libkcal.so.2
#20 0xb668a4ee in KCal::CalendarResources::load () from /usr/lib/libkcal.so.2
#21 0xb50c953e in KOrganizerPart::KOrganizerPart ()
   from /usr/lib/kde3/libkorganizerpart.so
#22 0xb50ca478 in KParts::GenericFactory<KOrganizerPart>::createPartObject ()
   from /usr/lib/kde3/libkorganizerpart.so
#23 0xb7deeddf in KParts::Factory::createPart () from /usr/lib/libkparts.so.2
#24 0xb7e26b8d in Kontact::Core::createPart ()
   from /usr/lib/libkpinterfaces.so.1
#25 0xb7e26f97 in Kontact::Plugin::loadPart ()
   from /usr/lib/libkpinterfaces.so.1
#26 0xb597d1c5 in KOrganizerPlugin::createPart ()
   from /usr/lib/kde3/libkontact_korganizerplugin.so
#27 0xb7e251b2 in Kontact::Plugin::part () from /usr/lib/libkpinterfaces.so.1
#28 0x08061160 in ?? ()
#29 0x082f2010 in ?? ()
#30 0x00000000 in ?? ()