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：
# j+ f) y, S. T" e* V0 d1 hif nparts(coneyor001)<5
pull from buf1 with labor1 using path
# Q  `7 Q* x, o7 belse
* E5 R8 a1 h7 @: S" G6 }9 lwait
/ h+ g6 ]8 p, O5 B+ }endif