Мод Belt Balancer (Improved Performance) (3.2.0) вызвал неустранимую ошибку.
Пожалуйста, сообщите об этой ошибке автору мода.

Error while running event belt-balancer-performance::on_nth_tick(4)
LuaTransportLine API call when LuaTransportLine was invalid.
stack traceback:
[C]: in function 'len'
__belt-balancer-performance/objects/balancer.lua:198: in function 'run'
belt-balancer-performance/helper/message-handler.lua:33: in function <belt-balancer-performance/helper/message-handler.lua:31>

I don't know if you noticed, but you sent it in to the wrong mod.