The game crashes with the following message when started with Shield Projector enabled:

Error ModManager.cpp:1558: Failed to load mod "careful_driver": __careful_driver__/data/cars-in-void.lua:21: attempt to index field 'layers' (a nil value)
stack traceback:
        __careful_driver__/data/cars-in-void.lua:21: in main chunk
        [C]: in function 'require'
        __careful_driver__/data-final-fixes.lua:2: in main chunk

fixed in next release. checked with the full space exploration mod as well.

same for Hovercrafts. https://mods.factorio.com/mod/Hovercrafts
i assume it would be a different fix tho. you want to preserve its original functionality of flying over stuff. just disable the 'careful driver' for hovercrafts, helicopters, airplanes, etc altogether

thanks for the mod by the way. i really enjoy it.