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：
9 y4 G) w* @) B/ lif nparts(coneyor001)<5
pull from buf1 with labor1 using path
: i' c& a+ `6 y& g; _) b9 Relse
wait
* F2 p1 B2 e: W* S: e2 J; N7 b5 ?endif