No interpreter for TVirtualStreamerInfo

[Henga]

ROOT Version: 6.22.06
Platform: Virtual Ubuntu20.04
Compiler: Not Provided

---

I’m trying to run a customized Pythia example main91 with addition of TFile and TH1D. Program is made with no errors and runs fine until following error occurs:

Error in <TClass::LoadClassInfo>: no interpreter information for class TVirtualStreamerInfo is available even though it has a TClass initialization routine.
corrupted double-linked list
Aborted (core dumped)

I’m using Ubuntu in VirtualBox on Win10. All prerequisites installed.

[jalopezg]

Hello @Henga,

Welcome to the ROOT forum. In order for us to help you, could you please provide more information on your environment and the source code of your example?

Cheers,
J.

[Henga]

Sure. Here is the code I’m trying to run.

#include "Pythia8/Pythia.h"
#include "Pythia8/HeavyIons.h"
#include "TFile.h"
#include "TH1.h"

using namespace Pythia8;

int main() {

  TFile* outfile = new TFile("outfile.root","RECREATE");
  TH1D * wounded = new TH1D("n_wounded","n_wounded", 270, -0.5, 270.5);
  TH1D * sumch = new TH1D("sum_of_charge","sum_of_charge", 1000, 0, 1000);
  Pythia pythia;

  pythia.readString("Beams:idA = 1000290630");
  pythia.readString("Beams:idB = 1000791970");
  pythia.readString("Beams:eA = 99.9");
  pythia.readString("Beams:eB = 100");  
  pythia.readString("Beams:frameType = 2");

  pythia.readString("HeavyIon:SigFitErr = "
                    "0.02,0.02,0.1,0.05,0.05,0.0,0.1,0.0");
  pythia.readString("HeavyIon:SigFitDefPar = "
                    "10.12,1.91,0.33,0.0,0.0,0.0,0.0,0.0");
  pythia.readString("HeavyIon:SigFitNGen = 0");
  
  pythia.init();
  double sumw = 0.0;
  // Loop over events.
  int nEvents = 100;
  for ( int iEvent = 0; iEvent < nEvents; ++iEvent ) {
    if ( !pythia.next() ) continue;
    double sumcharge = 0.0;
    for (int i = 0; i < pythia.event.size(); ++i) {
      Particle & p = pythia.event[i];
      if ( p.isFinal() ) {
        double eta = p.eta();
        if (abs(eta) < 3.1 && abs(eta) < 4.0 ){
          sumcharge +=(p.charge());
        }
      }
    }

    double weight = pythia.info.weight();
    sumw += weight;
    int nw = pythia.info.hiInfo->nAbsTarg() +
             pythia.info.hiInfo->nDiffTarg() +
             pythia.info.hiInfo->nAbsProj() +
             pythia.info.hiInfo->nDiffProj();
             
    wounded->Fill(nw, weight);
    sumch->Fill(sumcharge, weight);
  }

  wounded->Write();
  sumch->Write();
   
  return 0;
}

As for environment, what information would be useful and relevant here?

[Wile_E_Coyote]

Right before “return 0;”, try to add:
delete outfile; // automatically deletes all "owned" histograms, too

[Henga]

It worked, thank you.