questions about G4Region and FastSimulationModel

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Hello,

I want to do a Fast Simulation with a PMT logical volume, part of my code is:

  G4Region *PmtRegion = new G4Region("PMT-Region");
  PmtRegion->AddRootLogicalVolume(pmt_log);/*the pmt_log is the
 sensitive detector*/
  new PMTOpticalModel( "pmt_optical_model", pmt_phys);

and the class PMTOpticalModel is inherited from G4VFastSimulationModel, its constructor is:

PMTOpticalModel::PMTOpticalModel (G4String modelName,
                                  G4VPhysicalVolume* envelope_phys)
  : G4VFastSimulationModel(modelName, envelope_phys->GetLogicalVolume()
   ->GetRegion())
{......
}

the program runs well and the results seems right, and there are normal output information about the optical photons in the PMT Optical Model, but there are some warnings:

WARNING - G4Region::G4Region()
          Region PMT-Region already existing in store !

*** G4Exception : InvalidSetup
      issued by : G4Region::G4Region()
The region has NOT been registered !
*** This is just a warning message.
G4ProcessManager::GetAttribute(): particle[GenericIon]
  index out of range 
  #processes[2]  index [-1]
G4ProcessManager::GetAttribute(): particle[GenericIon]
  index out of range 
  #processes[2]  index [-1]

What's the meaning of the warnings? if the region isn't registered, why the FastSimulationProcess, PMTOpticalModel have functions on optical photons when they hit on the PMTs?

Thank you!