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？
7 J- H4 b( j; }- s
conveyor元素的input rule：
9 I% e" V4 ?5 Xif nparts(coneyor001)<5
pull from buf1 with labor1 using path
else
& z; [/ `( F! A) y) |1 T1 Y, uwait
5 Z# c& U) s) y1 o9 @5 y' U. |/ R5 fendif