I can't fly to Nauvis. After the rocket launch, I see the following:
"Error while running event lignumis::on_nth_tick(903222)
Unknown entity name: kr-spaceship-reactor
stack traceback:
[C]: in function 'can_place_entity'
core/lualib/crash-site.lua:208: in function 'create_crash_site'
lignumis/scripts/to-nauvis.lua:56: in function 'init_freeplay'
lignumis/scripts/to-nauvis.lua:69: in function 'transit_player'
lignumis/scripts/to-nauvis.lua:172: in function <lignumis/scripts/to-nauvis.lua:171>"

Can you provide me a savegame? I guess you are playing with K2SO? I currently don't support that but I can have a look.