Got this error message when loading:
Failed to load mods: swap-angels-concrete/data-final-fixes.lua:4: attempt to index field 'placeable_by' (a nil value)
stack traceback:
swap-angels-concrete/data-final-fixes.lua:4: in function 'fixup'
swap-angels-concrete/data-final-fixes.lua:12: in function 'swap'
swap-angels-concrete/data-final-fixes.lua:15: in main chunk
