help with ltb2x

quick question im using ltb2x trying to mess around with a few ltb's extracted rs.rez and trying to open a few files in there but it keeps saying tragic error does ne one have ne idea what im doing wrong?

does anyone have any advise

There are only several guns that you can extract a .x out of (m417 sb, m4a1 cqbr, l96 super mag). You can also extract equips but you'll get an error when you try to load it in blender