Creating a custom motorcycle using bike mesh problem

Hi hi, powerful community,  I wanna try to create or port custom bikes to sims4, I ve already modded other things, but actually I have a problem trying to port LOD1 medium to package, it keep saying your mesh has a vertex group that inst part of the mesh.
this is ultraweird cause LOD0 ported perfectly. with exactly same bones, LOD vertex groups etc.

I even exported LOD1 original bike mesh  from university expansion, it has exaclty the same bones, vertex groups, lod as LOD0 original mesh.

I need to port LOD1 with vertex groups otherwise if i delete them motorcycle mesh parts just fly around, I know is possible, necrodog and other creators already made ones. can someone explain me why program cannot import lod1, is a program mistake or what is causing this ? Thanks in advice.