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？
9 @- g1 ?8 L3 j$ g
conveyor元素的input rule：
if nparts(coneyor001)<5
% }. ~7 y3 z& k& }5 opull from buf1 with labor1 using path
else
, f1 l- v$ e! Bwait
endif