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？
: e; h8 L9 c3 u+ B+ u; e
conveyor元素的input rule：
% z0 y  F" w; B* w$ O7 J" e: Iif nparts(coneyor001)<5
pull from buf1 with labor1 using path
; Q) x7 ^( b$ s; y& D/ x& K1 |else
; o' N5 r$ g$ s- e, @1 `$ ^wait
( @* ?/ T$ I5 u. V6 Oendif