The mod Useful Combinators (0.4.7) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event UsefulCombinators::on_tick (ID 0)
Key "index" not found in property tree at ROOT.parameters
stack traceback:
[C]: in function 'newindex'
__UsefulCombinators/control.lua:1782: in function 'on_tick'
UsefulCombinators/control.lua:2237: in function <UsefulCombinators/control.lua:2232>
