I am using root version, Version 3.03/07 5 August 2002 For this version there is no TTree::SetMaxTreeSize or GetMaxTreeSize. Instead I am using the TChain::Merge method. The program indeed is opening multiple files. At the start of the program, I get the printout: >>Merge: Switching to new file: results/topAna_1.root at entry: 260715 >>Merge: Switching to new file: results/topAna_2.root at entry: 509747 So root is calculating what files it will open based on the tree size and the number of events in the input chain. However, sometime after opening the _1 file, I start to get a slew of errors, one for every branch element in my tree: >> Error in <TBasket::Create>: Cannot allocate 28338 bytes for ID = eleA.BCPx Title = topAna Does anyone understand this error and what I am doing wrong? Thanks, Michael Gold
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