so I installed a few engine mods and when I start the game it crashes I checked the error log and this is what I got
Unregistrable node: parts\engines\Nissan_Engine_Pack.rpk:00000041 (invalid parent parts.rpk:00008987)
Unregistrable node: parts\engines\Boxer4.rpk:00000001 (invalid parent parts.rpk:00009887)