[Cola] ReindexingBoneIdx Error

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Ohayou Gozaimasu

I ran into a little Problem today

Well i exported/converted hundrets of Models and Animations from other Games to Flyff.
I already figured out 90% of Colas Error Messages but i stuck at one >.<

I exported a Model and when i load it into Cola,
Cola tells me this Error:



I have neither an Idea what this Error means nor how i can solve it >.<

1 last thing that is a little bit suspicious.
If i export the Model w/o Vertex Data, it loads normaly and shows me 4 Material Blocks
in the Info Panel.
But if i load the Model w/ Vertex Data it shows me this Error above and
also changes the Material Blocks in the Info Panel from 4 to 7.

Any Ideas?