Hi Rene, I run Analyse as interpreted, just typing '.x Analyse.C' each time. As we want a quick turn around on the analysis, and are tuning cuts, we'd prefer to run interpreted if possible. I added the lines you suggested, but the error in loading the libraries is still there. I assumed you meant add in them in the function like: int Analyse() { gROOT->LoadClass("TProof","Proof"); gROOT->LoadClass("TTreePlayer","TreePlayer"); .... } When you say delete the selector, do you mean just add a 'delete sel' statement before the return? Or would I have to do: TSelector *sel = new TSelector(); sel=TSelector::GetSelector("EventSelector.C++"); ..... delete sel; (This looks strange to me, but if the second line is *sel, I get a seg fault at the delete statement.) Sorry for the continuing problems! Thanks, Ben Morgan. -- ------------------------------------------------------------------------------- Mr. Ben Morgan Postgraduate Student University of Sheffield Department of Physics & Astronomy Hicks Building Hounsfield Road Sheffield S3 7RH -------------------------------------------------------------------------------
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