orcad全波整流电路

一个运放的全波整流电路，大家帮忙哪弄错了
ERROR(ORPSIM-15141): Less than 2 connections at node M_UN0001.

ERROR(ORPSIM-15141): Less than 2 connections at node M_UN0002.

ERROR(ORPSIM-15142): Node M_UN0001 is floating

ERROR(ORPSIM-15142): Node M_UN0002 is floating