The object unassigned weigths

I just got this error and after much work in weigth paint of my gun no have any solution.I create model in makehuman then exported to blender and impot a free Gun model then create all rigs and animations.I know error with more of 1 object for export give error everytime.

I just export with sucess to .FBX and .OBJ default format of blender 2.75 without any error

please look a blender forum i posted but not answer cause is not a blender error is problem with better collada dae only http://blender.stackexchange.com/questions/65380/export-error-to-better-collada-object-has-unassigned-weights

please if anybody know how solve that please contact me to smartgames1010@gmail.com

thank you