Thread: K(Copy Crashing in Ubuntu 11.04 when trying to open a DVD

i following crash report:

application: k9copy (k9copy), signal: segmentation fault
[current thread 1 (thread 0xb7866710 (lwp 2652))]

thread 4 (thread 0xb7609b70 (lwp 2654)):
#0 0x0037f371 in pthread_mutex_lock () /lib/i386-linux-gnu/libpthread.so.0
#1 0x02289752 in g_main_context_check () /lib/i386-linux-gnu/libglib-2.0.so.0
#2 0x0228a03a in ?? () /lib/i386-linux-gnu/libglib-2.0.so.0
#3 0x0228a92b in g_main_loop_run () /lib/i386-linux-gnu/libglib-2.0.so.0
#4 0x02174304 in ?? () /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#5 0x022b32df in ?? () /lib/i386-linux-gnu/libglib-2.0.so.0
#6 0x0037ce99 in start_thread () /lib/i386-linux-gnu/libpthread.so.0
#7 0x01cdf73e in clone () /lib/i386-linux-gnu/libc.so.6

thread 3 (thread 0xb6e08b70 (lwp 2655)):
#0 0x00394416 in __kernel_vsyscall ()
#1 0x01ced753 in ?? () /lib/i386-linux-gnu/libc.so.6
#2 0x01c80b94 in ?? () /lib/i386-linux-gnu/libc.so.6
backtrace stopped: previous frame identical frame (corrupt stack?)

thread 2 (thread 0xb4724b70 (lwp 2656)):
#0 0x00394416 in __kernel_vsyscall ()
#1 0x01ced753 in ?? () /lib/i386-linux-gnu/libc.so.6
#2 0x01c80b94 in ?? () /lib/i386-linux-gnu/libc.so.6
backtrace stopped: previous frame identical frame (corrupt stack?)

thread 1 (thread 0xb7866710 (lwp 2652)):
[kcrash handler]
#7 0x01c7c9f1 in ?? () /lib/i386-linux-gnu/libc.so.6
#8 0x01c7ef53 in malloc () /lib/i386-linux-gnu/libc.so.6
#9 0x0811497f in ___dvdreadbytes ()
#10 0x0811cabc in ___iforead_pgci_ut ()
#11 0x0811fdd6 in ?? ()
#12 0x0811fffd in ___ifoopen ()
#13 0x080fc4f5 in ?? ()
#14 0x080f5695 in ?? ()
#15 0x080ebe0b in ?? ()
#16 0x0809c088 in ?? ()
#17 0x08066b53 in _start ()

i've gone through of suggested dependencies, , seem there, don't know how read above know if/what's going on.

help?!?!?

thanks.

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