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？

& e: E# Y$ c: E8 n1 n- `, K+ A! {9 Hconveyor元素的input rule：
if nparts(coneyor001)<5
& l0 |! }3 a; ?, U; Z! g; b. \pull from buf1 with labor1 using path
9 m% n2 j5 m0 M, b' h: }) q% T9 _4 w& ?5 Selse
. ^" v% b- v$ k/ m2 j4 y. C0 s( Z$ pwait
% s. F3 d$ T( X" q( O) y( zendif