Hi, I'm using root version 3.02/07 and have some problems with the TChain::AddFriend method. In absolute accordance with the example in the users guide i do: TChain nu("h100"); nu.Add("file1.root"); // file1 contains one tree named h100 TChain nufriend("tfriend"); nufriend.Add("friendfile.root"); // friendfile contains one tree named // tfriend nu.AddFriend("tfriend"); //then gives the message: Warning in <TChain::AddFriend>: Unknown TChain tfriend and trying to access any variable contained in the friedfile [eg by nu.Draw("any_friend_variable")] results in: *** Break *** segmentation violation The individual trees are OK. [I can access them by h100/tfriend.Draw(...)] Could anybody tell me what goes wrong ? Thanks in advance Henrike
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