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？
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conveyor元素的input rule：
/ y& n# M. R1 t: ?( f3 X; \4 k5 [if nparts(coneyor001)<5
; V# M2 _; ^0 u& K  e9 e' R& e5 wpull from buf1 with labor1 using path
# F: O8 u' ^5 K, P6 aelse
, V- v/ p/ H: {6 [+ N1 I" {wait
endif