Warning in : The StreamerInfo for version 1 of class TObject read from the file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has a different checksum than the previously loaded StreamerInfo. Reading objects of type TObject from the file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root (and potentially other files) might not work correctly. Most likely the version number of the class was not properly updated [See ClassDef(TObject,1)]. Warning in : The following data member of the on-file layout version 1 of class 'TObject' differs from the in-memory layout version 1: unsigned int fUniqueID; // vs UInt_t fUniqueID; // Warning in : The following data member of the on-file layout version 1 of class 'TObject' differs from the in-memory layout version 1: unsigned int fBits; // vs UInt_t fBits; // Warning in : The StreamerInfo of class TCollection read from file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has the same version (=3) as the active class but a different checksum. You should update the version to ClassDef(TCollection,4). Do not try to write objects with the current class definition, the files will not be readable. Warning in : The following data member of the on-file layout version 3 of class 'TCollection' differs from the in-memory layout version 3: int fSize; // vs Int_t fSize; // Warning in : The StreamerInfo of class TAttLine read from file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has the same version (=1) as the active class but a different checksum. You should update the version to ClassDef(TAttLine,2). Do not try to write objects with the current class definition, the files will not be readable. Warning in : The following data member of the on-file layout version 1 of class 'TAttLine' differs from the in-memory layout version 1: short fLineColor; // vs Color_t fLineColor; // Warning in : The following data member of the on-file layout version 1 of class 'TAttLine' differs from the in-memory layout version 1: short fLineStyle; // vs Style_t fLineStyle; // Warning in : The following data member of the on-file layout version 1 of class 'TAttLine' differs from the in-memory layout version 1: short fLineWidth; // vs Width_t fLineWidth; // Warning in : The StreamerInfo of class TAttFill read from file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has the same version (=1) as the active class but a different checksum. You should update the version to ClassDef(TAttFill,2). Do not try to write objects with the current class definition, the files will not be readable. Warning in : The following data member of the on-file layout version 1 of class 'TAttFill' differs from the in-memory layout version 1: short fFillColor; // vs Color_t fFillColor; // Warning in : The following data member of the on-file layout version 1 of class 'TAttFill' differs from the in-memory layout version 1: short fFillStyle; // vs Style_t fFillStyle; // Warning in : The StreamerInfo of class TAttMarker read from file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has the same version (=2) as the active class but a different checksum. You should update the version to ClassDef(TAttMarker,3). Do not try to write objects with the current class definition, the files will not be readable. Warning in : The following data member of the on-file layout version 2 of class 'TAttMarker' differs from the in-memory layout version 2: short fMarkerColor; // vs Color_t fMarkerColor; // Warning in : The following data member of the on-file layout version 2 of class 'TAttMarker' differs from the in-memory layout version 2: short fMarkerStyle; // vs Style_t fMarkerStyle; // Warning in : The following data member of the on-file layout version 2 of class 'TAttMarker' differs from the in-memory layout version 2: float fMarkerSize; // vs Size_t fMarkerSize; // Warning in : The StreamerInfo of class TH1 read from file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has the same version (=7) as the active class but a different checksum. You should update the version to ClassDef(TH1,8). Do not try to write objects with the current class definition, the files will not be readable. Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: int fNcells; // vs Int_t fNcells; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: short fBarOffset; // vs Short_t fBarOffset; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: short fBarWidth; // vs Short_t fBarWidth; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: double fEntries; // vs Double_t fEntries; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: double fTsumw; // vs Double_t fTsumw; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: double fTsumw2; // vs Double_t fTsumw2; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: double fTsumwx; // vs Double_t fTsumwx; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: double fTsumwx2; // vs Double_t fTsumwx2; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: double fMaximum; // vs Double_t fMaximum; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: double fMinimum; // vs Double_t fMinimum; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: double fNormFactor; // vs Double_t fNormFactor; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: int fBufferSize; // vs Int_t fBufferSize; // Warning in : The following data member of the on-file layout version 7 of class 'TH1' differs from the in-memory layout version 7: double* fBuffer; //fBufferSize vs Double_t* fBuffer; //fBufferSize Warning in : The StreamerInfo of class TAxis read from file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has the same version (=9) as the active class but a different checksum. You should update the version to ClassDef(TAxis,10). Do not try to write objects with the current class definition, the files will not be readable. Warning in : The following data member of the on-file layout version 9 of class 'TAxis' differs from the in-memory layout version 9: int fNbins; // vs Int_t fNbins; // Warning in : The following data member of the on-file layout version 9 of class 'TAxis' differs from the in-memory layout version 9: double fXmin; // vs Double_t fXmin; // Warning in : The following data member of the on-file layout version 9 of class 'TAxis' differs from the in-memory layout version 9: double fXmax; // vs Double_t fXmax; // Warning in : The following data member of the on-file layout version 9 of class 'TAxis' differs from the in-memory layout version 9: int fFirst; // vs Int_t fFirst; // Warning in : The following data member of the on-file layout version 9 of class 'TAxis' differs from the in-memory layout version 9: int fLast; // vs Int_t fLast; // Warning in : The following data member of the on-file layout version 9 of class 'TAxis' differs from the in-memory layout version 9: unsigned short fBits2; // vs UShort_t fBits2; // Warning in : The following data member of the on-file layout version 9 of class 'TAxis' differs from the in-memory layout version 9: bool fTimeDisplay; // vs Bool_t fTimeDisplay; // Warning in : The StreamerInfo of class TAttAxis read from file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has the same version (=4) as the active class but a different checksum. You should update the version to ClassDef(TAttAxis,5). Do not try to write objects with the current class definition, the files will not be readable. Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: int fNdivisions; // vs Int_t fNdivisions; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: short fAxisColor; // vs Color_t fAxisColor; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: short fLabelColor; // vs Color_t fLabelColor; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: short fLabelFont; // vs Style_t fLabelFont; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: float fLabelOffset; // vs Float_t fLabelOffset; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: float fLabelSize; // vs Float_t fLabelSize; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: float fTickLength; // vs Float_t fTickLength; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: float fTitleOffset; // vs Float_t fTitleOffset; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: float fTitleSize; // vs Float_t fTitleSize; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: short fTitleColor; // vs Color_t fTitleColor; // Warning in : The following data member of the on-file layout version 4 of class 'TAttAxis' differs from the in-memory layout version 4: short fTitleFont; // vs Style_t fTitleFont; // Warning in : The StreamerInfo of class TProfile read from file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has the same version (=6) as the active class but a different checksum. You should update the version to ClassDef(TProfile,7). Do not try to write objects with the current class definition, the files will not be readable. Warning in : The following data member of the on-file layout version 6 of class 'TProfile' differs from the in-memory layout version 6: double fYmin; // vs Double_t fYmin; // Warning in : The following data member of the on-file layout version 6 of class 'TProfile' differs from the in-memory layout version 6: double fYmax; // vs Double_t fYmax; // Warning in : The following data member of the on-file layout version 6 of class 'TProfile' differs from the in-memory layout version 6: double fTsumwy; // vs Double_t fTsumwy; // Warning in : The following data member of the on-file layout version 6 of class 'TProfile' differs from the in-memory layout version 6: double fTsumwy2; // vs Double_t fTsumwy2; // Warning in : The StreamerInfo of class TH2 read from file /afs/cern.ch/work/e/egraveri/gangaWork/workspace/egraveri/LocalXML/7/0/output/STTrackMonitors.root has the same version (=4) as the active class but a different checksum. You should update the version to ClassDef(TH2,5). Do not try to write objects with the current class definition, the files will not be readable. Warning in : The following data member of the on-file layout version 4 of class 'TH2' differs from the in-memory layout version 4: double fScalefactor; // vs Double_t fScalefactor; // Warning in : The following data member of the on-file layout version 4 of class 'TH2' differs from the in-memory layout version 4: double fTsumwy; // vs Double_t fTsumwy; // Warning in : The following data member of the on-file layout version 4 of class 'TH2' differs from the in-memory layout version 4: double fTsumwy2; // vs Double_t fTsumwy2; // Warning in : The following data member of the on-file layout version 4 of class 'TH2' differs from the in-memory layout version 4: double fTsumwxy; // vs Double_t fTsumwxy; //