Attempt to add part at undefined sensor 1 on conveyor coneyor001？

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Attempt to add part at undefined sensor 1 on conveyor coneyor001是怎么回事？

# O9 Z6 F0 g; `6 G4 A/ Z3 sconveyor元素的input rule：
, J* F2 K  U# [8 @4 B0 W: p2 iif nparts(coneyor001)<5
, {( W8 d1 d# K, Ppull from buf1 with labor1 using path
  t/ a  p$ N+ C$ Melse
. q4 l2 j8 N, m; U3 Wwait
endif