i tried it on a different file with the same archive type and compression, it still crashes. what should i do?

Application: Ark (ark), signal SIGABRT
[Thread debugging using libthread_db enabled]
[New Thread 0xb61676c0 (LWP 14867)]
[New Thread 0xb37ccb90 (LWP 14871)]
[New Thread 0xb4375b90 (LWP 14870)]
[KCrash handler]
#6  0xb7ff4430 in __kernel_vsyscall ()
#7  0xb6a29880 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb6a2b248 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb75db795 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb75db872 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb75db915 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb48f5987 in Part::slotPreview (this=0x8bd59f8, index=@0x8b11078)
    at /build/buildd/kdeutils-4.1.2/ark/part/part.cpp:238
#13 0xb48f3342 in Part::qt_metacall (this=0x8bd59f8, 
    _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0xbfef54dc)
    at /build/buildd/kdeutils-4.1.2/obj-i486-linux-gnu/ark/part/moc_part.cpp:106
#14 0xb76e8a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb76e97e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0xb72475d3 in QAbstractItemView::doubleClicked ()
   from /usr/lib/libQtGui.so.4
#17 0xb7293500 in QTreeView::mouseDoubleClickEvent ()
   from /usr/lib/libQtGui.so.4
#18 0xb6ddd7f2 in QWidget::event () from /usr/lib/libQtGui.so.4
#19 0xb7114f53 in QFrame::event () from /usr/lib/libQtGui.so.4
#20 0xb71ab75f in QAbstractScrollArea::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#21 0xb7256c4f in QAbstractItemView::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#22 0xb728e964 in QTreeView::viewportEvent () from /usr/lib/libQtGui.so.4
#23 0xb71add05 in ?? () from /usr/lib/libQtGui.so.4
#24 0xb76d304a in QCoreApplicationPrivate::sendThroughObjectEventFilters ()
   from /usr/lib/libQtCore.so.4
#25 0xb6d858ca in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#26 0xb6d8e121 in QApplication::notify () from /usr/lib/libQtGui.so.4
#27 0xb7ba372d in KApplication::notify (this=0xbfef668c, receiver=0x8b33368, 
    event=0xbfef5dc8)
    at /build/buildd/kde4libs-4.1.2/kdeui/kernel/kapplication.cpp:311
#28 0xb76d3e61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#29 0xb6d8d3ae in QApplicationPrivate::sendMouseEvent ()
   from /usr/lib/libQtGui.so.4
#30 0xb6df7696 in ?? () from /usr/lib/libQtGui.so.4
#31 0xb6df6a25 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#32 0xb6e207ea in ?? () from /usr/lib/libQtGui.so.4
#33 0xb64f96f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb64fcda3 in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb64fcf61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb76fe478 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#37 0xb6e1fee5 in ?? () from /usr/lib/libQtGui.so.4
#38 0xb76d252a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#39 0xb76d26ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#40 0xb76d4da5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#41 0xb6d85767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#42 0x0804e75f in main (argc=4, argv=0xbfef6874)
    at /build/buildd/kdeutils-4.1.2/ark/app/main.cpp:112
#0  0xb7ff4430 in __kernel_vsyscall ()