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PV analysis

Hey All , I'm new to PSSE, I'm using iec example in PSSE and trying to do a PV analysis for it, using PSSE PV analysis tool. I tried to create sub,mon and con files as below . But I get an error "PVENGINE6 Specified subsystems overlap " any help is appreciated ,

This is my sub

SUBSYSTEM 'SOURCE'
  BUS 1
END

SUBSYSTEM 'SINK'
  BUS 2
  BUS 3
  BUS 4
  BUS 5
  BUS 6
  BUS 7
  BUS 8
  BUS 9
  BUS 31
  BUS 41
  BUS 81
  BUS 101
  BUS 201
END
END

this is my .con

CONTINGENCY Open_branch
TRIP BRANCH FROM BUS 7 TO BUS 9 CKT 1
END
CONTINGENCY DISCONNECT_GENERATOR
REMOVE UNIT M2 FROM BUS 9 CKT 1
END
END

and this is my .mon

COM
COM MONITORED element file entry created by PSS(R)E Config File Builder
COM
MONITOR VOLTAGE RANGE SUBSYSTEM 'TESTSUB' 0.950 1.050
MONITOR VOLTAGE DEVIATION SUBSYSTEM 'TESTSUB' 0.030 0.060
MONITOR BRANCHES IN SUBSYSTEM 'TESTSUB'
MONITOR TIES FROM SUBSYSTEM 'TESTSUB'
END