ERROR(ORNET-1113): Bad PSpice net name on part U5

Hello,

while simulation in pspice-the error appears-

INFO(ORCAP-2191): Creating PSpice Netlist
INFO(ORNET-1041): Writing PSpice Flat Netlist D:\dc workspace\orcad\sasa mix pspice-PSpiceFiles\SCHEMATIC1\SCHEMATIC1.net
ERROR(ORNET-1113): Bad PSpice net name on part U5

please find below ckt.

what can be the issue ,and how to solve the issue??

Regards

DC