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？
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conveyor元素的input rule：
if nparts(coneyor001)<5
+ p- J5 g4 d: Y3 {6 M9 ]1 b; I' vpull from buf1 with labor1 using path
else
wait
, L* N7 |4 r8 A4 L( t! E2 [endif