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？
$ n3 j) j( k9 P" x: n) n; X
( `% i% V, B: o: j6 ]; n9 w0 yconveyor元素的input rule：
1 g2 {; W. `5 aif nparts(coneyor001)<5
pull from buf1 with labor1 using path
9 z2 C+ X6 Z9 S7 [9 A. jelse
7 ^$ v: y3 e( l7 _& ?- hwait
endif