GRAS crashes for Z >= 2

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Hello,

I'm using GRAS 3.3 as external application with GEANT4.9.6.p04. I'm building a satellite for LEO mission and taking the macro files from SPENVIS as input. I use QBBC as my physics list.

The simulation runs well for trapped electrons, trapped protons and solar protons. When running with GCR Z = 1 source, I start to get some warning messages:

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : had012
      issued by : G4HadronicProcess:CheckResult()
Warning: Bad energy non-conservation detected, will re-sample the interaction
 Process / Model: ionInelastic / Binary Light Ion Cascade
 Primary: Li7[0.0] (1000030070), E= 15557.6, target nucleus (13,27)
 E(initial - final) = 6668.06 MeV.

*** This is just a warning message. *** -------- WWWW -------- G4Exception-END --------- WWWW -------

But the simulation ends with no further problems. When I run with GCR Z >= 2, the warning messages become very frequent, till the simulation crashes:

In /home/lghizoni/Geant4/geant4.9.6/source/processes/hadronic/models/parton_string/management/src/G4VPartonStringModel.cc, line 81: ===> G4VPartonStringModel::Scatter(): fails to generate strings

-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : had006
      issued by : G4HadronicProcess::PostStepDoIt
In /home/lghizoni/Geant4/geant4.9.6/source/processes/hadronic/models/parton_string/management/src/G4VPartonStringModel.cc, line 81:
===> G4VPartonStringModel::Scatter(): fails to generate strings
Call for FTFP
Target element H  Z= 1  A= 1
Unrecoverable error in the method ApplyYourself of ionInelastic
TrackID= 1  ParentID= 0  Li7[0.0]
Ekin(GeV)= 50.4311;  direction= (-0.30308,-0.102135,0.947476)
Position(mm)= (-59.0097,-284.055,-1586.32);  material Hydrazine
PhysicalVolume  <Fuel>
 ApplyYourself failed

*** Fatal Exception *** core dump *** -------- EEEE -------- G4Exception-END --------- EEEE -------

*** G4Exception: Aborting execution *** Aborted

I tried to change the physics list to FTFP_BERT_HP and Shielding, but the simulation still crashes.

I thank very much for help, since I cannot find a solution for the problem.

Leonardo.