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   42    msg =  
" You are instantiating G4UserStackingAction BEFORE your\n";
 
   43    msg += 
"G4VUserPhysicsList is instantiated and assigned to G4RunManager.\n";
 
   44    msg += 
" Such an instantiation is prohibited by Geant4 version 8.0. To fix this problem,\n";
 
   45    msg += 
"please make sure that your main() instantiates G4VUserPhysicsList AND\n";
 
   46    msg += 
"set it to G4RunManager before instantiating other user action classes\n";
 
   47    msg += 
"such as G4UserStackingAction.";
 
   48    G4Exception(
"G4UserStackingAction::G4UserStackingAction()",