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：
' T  R8 `+ e, |# K  u9 R2 d! `* Hif nparts(coneyor001)<5
& m/ `' G9 M" o3 E4 O. c! ~8 W$ mpull from buf1 with labor1 using path
  |9 T, @4 K: ?; zelse
  q0 q- W7 j) u' I. W" a) a% {/ Dwait
$ n7 `- Y. b5 Gendif