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？

4 [/ Y) @: v9 f( c, z2 Iconveyor元素的input rule：
if nparts(coneyor001)<5
( O* a9 N; {: Z7 o1 [8 c1 l  V$ A7 Dpull from buf1 with labor1 using path
9 h3 Y9 }, H  Celse
8 [& x" w) f2 y6 |) `8 F: N2 Vwait
endif