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？
) j0 ~) `/ |1 I( A. v6 g/ R- M9 I
conveyor元素的input rule：
if nparts(coneyor001)<5
pull from buf1 with labor1 using path
; P/ Q4 o8 z, o7 j4 r2 @; Y( ]else
wait
0 E* Q/ q" a& S. Q6 c3 `3 x7 m" r" a# Gendif