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？

conveyor元素的input rule：
if nparts(coneyor001)<5
, v/ K! A4 e4 `pull from buf1 with labor1 using path
else
& I4 R) ]" A3 z, Await
endif