FS2004 Library Creator/mdl Tweaker error

Hi all,
can anyone assist with the following problem?
I have some gmax tree mdls that I want to remove shadows and unify normals.The gmax mdls load fine into library creator and run ok in FS. However if I run mdl tweaker on them and then try to create the bgl with library creator I get the following error:

upload_2015-10-21_19-22-10.png


I am sure it is something I am doing wrong but can't identify why it doesn't work.

Thanks!!
 
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