[Daynarr]

There is another way around it. When you are selecting players in game creation screen, you can create new empire with those new shipsets and make them computer controlled.
When you select them like that, they should use default AI scripts and be playable. Random empires never have race style that has been already selected, so it won't be causing these errors.

P.S. When you create new empire, make sure you have selected some minister style and leave 'Use race minister style' box unchecked.