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？
# d5 D7 o6 D1 A" Z# B" x
6 A5 ]' i7 O9 g% o% Aconveyor元素的input rule：
if nparts(coneyor001)<5
6 i  M, @& W; ^3 Vpull from buf1 with labor1 using path
* q( Z$ W, _! B% Selse
wait
endif