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？

4 [% Z1 V4 y3 L" G( Y8 v6 \conveyor元素的input rule：
if nparts(coneyor001)<5
pull from buf1 with labor1 using path
else
wait
endif