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？
: Z) [6 ^& ]) B  x* n1 Y4 [+ j
conveyor元素的input rule：
, w# n' P# u/ ^: s  }if nparts(coneyor001)<5
pull from buf1 with labor1 using path
else
. Q6 u4 K: S/ N5 E7 lwait
4 x; \7 ?( f$ T/ A8 [9 d1 Uendif