[ROOT] functions in Root

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Hi all!

I have the following problem in Root:
When I try to invoke the following function:

void findGoodTracks(LCDEvent *event, TObjArray *goodTrackList, UInt_t
*MCPartArray)
{
    const Double_t cosCut=0.9;
    const Double_t pCut=0.2;
    Int_t nTracks = event->Tracks()->GetEntries();
    int count = 0;
    LCDTrack *trk;
    LCDMcPart part;
    TVector3 ptrk;

    MCPartArray = new UInt_t[nTracks];
    for (int itrk=0; itrk<nTracks; itrk++)
    {
	trk = (LCDTrack *)(event.Tracks()->At(itrk));
	ptrk=trk->GetMomentumVector(0.0);
	if( (TMath::Abs(ptrk.CosTheta())) < cosCut &&
	    ptrk.Mag() > pCut)
	{
	    MCPartArray[count++] = trk->GetParticle();
	    part = (LCDMcPart
		    *)event.MCparticles()->At(trk->GetParticle());
	    goodTrackList->Add((TObject *)trk);
	}
    }
    return;
}

I get these errormessages

Error: Symbol event is not defined in current scope FILE:getFastMC.cc
LINE:31
*** Interpreter error recovered ***

Could anybody please explain this to me ?

Thanks,
	Jan

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