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：
& J2 O" S3 r3 i" M: ]. aif nparts(coneyor001)<5
pull from buf1 with labor1 using path
else
wait
5 m! n, G- b; cendif