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？

conveyor元素的input rule：
if nparts(coneyor001)<5
pull from buf1 with labor1 using path
: z# x1 y3 o  G5 X& ~5 U6 Celse
wait
0 b& l" O/ F% {endif