Jacek, I tried similar thing but could not reproduce the problem. Will you try following to get more information? root [0] .L ntuple.so root [1] ntuple *n=new ntuple() root [2] .L test.cxx root [3] .debug <<< Add this command root [4] .T <<< This one too root [5] n->Draw("x") Error: No symbol Draw("x") in current scope FILE:/tmp/01521caa LINE:1 (class ntuple*)0x85073d0 *** Interpreter error recovered *** root [6] n->Loop(test) .debug command turn on bytecode debugging mode which will give you a little more information. Please inform me what it says. Thank you Masaharu Goto
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