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？
1 Z# {3 I+ i6 v' m
conveyor元素的input rule：
: ^- `; b. J* a# Oif nparts(coneyor001)<5
$ N3 a' `7 c. G# }- bpull from buf1 with labor1 using path
else
wait
: e$ H2 @7 l9 a* v- }& L, |endif