Error Couldn't find the bone

[_dracus_]

It seems I crash a lot with that kind of errors

[29/10/2007 09:10:27] [BindableObject][bindable_object.cpp(99)] Couldn't find the bone (quiver_espalda)


this is the backtrace:

libs/libcore_client.so(_ZN10ClientBase14save_backtraceE v+0x7e) [0xb7db733e]
libs/libcore_client.so(_ZN10ClientBase12client_crashEi+ 0x17) [0xb7db76c7]
/lib/i686/cmov/libc.so.6 [0xb6ff3898]
/lib/ld-linux.so.2 [0xb7fb57f2]
/lib/i686/cmov/libc.so.6(gsignal+0x55) [0xb6ff37f5]
/lib/i686/cmov/libc.so.6(abort+0x101) [0xb6ff5181]
/lib/i686/cmov/libc.so.6 [0xb702adec]
/lib/i686/cmov/libc.so.6 [0xb7031389]
/lib/i686/cmov/libc.so.6 [0xb7032afe]
/lib/i686/cmov/libc.so.6(cfree+0x90) [0xb7036790]
/usr/lib/libstdc++.so.6(_ZdlPv+0x21) [0xb71f8ea1]
libs/libresource_system_extension.so(_ZN13Resource_MESH D0Ev+0x6f) [0xb778ee3f]
libs/libentity_system.so(_ZN13EntityManager11destroy_al lEv+0x109) [0xb7542c49]
libs/libentity_system.so(_ZN12EntitySystem20destroy_all _entitiesEv+0x3c7) [0xb75141d7]
libs/libcore_client.so(_ZN10ClientBase16destroy_entitie sEv+0x43) [0xb7db75d3]
libs/libregnum_client.so(_ZN10GameClient8finalizeEv+0x3 0) [0xb7f61a10]
libs/libregnum_client.so(_ZN10GameClientD0Ev+0x39) [0xb7f621b9]
./game(main+0x72) [0x8048b92]
/lib/i686/cmov/libc.so.6(__libc_start_main+0xe0) [0xb6fdf050]
./game(__gxx_personality_v0+0x61) [0x8048a81]

I'm using Debian Lenny with an NVIDIA card.