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？
8 d+ c, y% o1 h* e7 B& {& T- p
conveyor元素的input rule：
: t3 K+ C% w# ^; g, M+ C3 Mif nparts(coneyor001)<5
pull from buf1 with labor1 using path
1 L1 }2 A; C  @% b3 uelse
wait
endif