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
' {0 K" |& s- X0 _pull from buf1 with labor1 using path
else
( F  S7 A# c* [* ?  m, Nwait
& e2 A; C8 V0 ]endif