Fiberglass materia isues

I made a revision of a modele of mine to make it newer and fiberglass (mid 90's)
and I got an issue with the chassis material and the program freezes. now I cant get in to the sandbox.
A lua error wiith fiberglass

and I got an issue with the chassis material and the program freezes. now I cant get in to the sandbox.
A lua error wiith fiberglass
