backtrace

(gdb) run
Starting program: /home/marc/OpenMW/build/openmw --start Sud --debug
[Thread debugging using libthread_db enabled]
Data directory: /home/marc/OpenMW/build/data
[New Thread 0x7f148d123750 (LWP 22884)]
[New Thread 0x7f1483f6f950 (LWP 22887)]
[New Thread 0x7f148376e950 (LWP 22888)]
[New Thread 0x7f1482f6d950 (LWP 22889)]
[New Thread 0x7f148276c950 (LWP 22890)]
Adding /home/marc/OpenMW/build/data/Morrowind.bsa
Adding /home/marc/OpenMW/build/data/Tribunal.bsa
Adding /home/marc/OpenMW/build/data/Bloodmoon.bsa
Loading ESM /home/marc/OpenMW/build/data/Morrowind.esm
[New Thread 0x7f147cd42950 (LWP 22891)]
[New Thread 0x7f147c541950 (LWP 22892)]
loading cell 'Sud'

Press Q/ESC or close window to exit.
Playing /home/marc/OpenMW/build/data/Music/Explore/mx_explore_5.mp3
openmw: /home/marc/Tools/ogre-1-7-1/OgreMain/src/OgreMesh.cpp:1678: static void Ogre::Mesh::softwareVertexBlend(const Ogre::VertexData*, const Ogre::VertexData*, const Ogre::Matrix4* const*, size_t, bool): Assertion `srcElemPos && srcElemBlendIndices && srcElemBlendWeights && "You must supply at least positions, blend indices and blend weights"' failed.

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7f148d123750 (LWP 22884)]
0x00007f148a150fb5 in raise () from /lib/libc.so.6
(gdb) bt
#0  0x00007f148a150fb5 in raise () from /lib/libc.so.6
#1  0x00007f148a152bc3 in abort () from /lib/libc.so.6
#2  0x00007f148a149f09 in __assert_fail () from /lib/libc.so.6
#3  0x00007f148ca1903f in Ogre::Mesh::softwareVertexBlend (
    sourceVertexData=0x7f148718f4c8, targetVertexData=0x7f14871934e8, 
    blendMatrices=0x7fff9f67d940, numMatrices=<value optimized out>, 
    blendNormals=true)
    at /home/marc/Tools/ogre-1-7-1/OgreMain/src/OgreMesh.cpp:1678
#4  0x00007f148c95b4e2 in Ogre::Entity::updateAnimation (this=0x7f148d0efa98)
    at /home/marc/Tools/ogre-1-7-1/OgreMain/src/OgreEntity.cpp:839
#5  0x00007f148c95df2b in Ogre::Entity::_updateRenderQueue (
    this=0x7f148d0efa98, queue=0x7f148707e1b8)
    at /home/marc/Tools/ogre-1-7-1/OgreMain/src/OgreEntity.cpp:603
#6  0x00007f148ca927bf in Ogre::RenderQueue::processVisibleObject (
    this=0x7f148707e1b8, mo=0x7f148d0efa98, cam=0x7f148d046708, 
    onlyShadowCasters=false, visibleBounds=0x7f1486979a20)
    at /home/marc/Tools/ogre-1-7-1/OgreMain/src/OgreRenderQueue.cpp:295
#7  0x00007f1484478103 in Ogre::OctreeNode::_addToRenderQueue (
    this=0x7f148d0d5c38, cam=0x7f148d046708, queue=0x7f148707e1b8, 
    onlyShadowCasters=false, visibleBounds=0x7f1486979a20)
    at /home/marc/Tools/ogre-1-7-1/PlugIns/OctreeSceneManager/src/OgreOctreeNode.cpp:184
#8  0x00007f1484479d82 in Ogre::OctreeSceneManager::walkOctree (