Attempt to add part at undefined sensor 1 on conveyor coneyor001？

dd13616

Attempt to add part at undefined sensor 1 on conveyor coneyor001是怎么回事？

conveyor元素的input rule：
3 q9 z% ~1 W/ R" _4 U; vif nparts(coneyor001)<5
pull from buf1 with labor1 using path
4 J7 c/ r+ V* N3 J0 T! d. `else
wait
endif