Dear root users, I tried to creat a TChain to chain 2 trees in 2 root files as follows: root{] TChain chain("tt") root[] chain.Add("file1.root") root[] chain.Add("file2.root") root[] tt.StartViewer() After typing the first 3 lines, nothing wrong happens. That seems the TChain is created. But after typing the 4th command to view the content of the TChain, an error appears: Symbol tt is not defined in current scope FILE:(tmpfile) LINE:1 Failed to evaluate tt.StartViewer....... I've checked the tree name of both trees separately before with the Tree Viewer. So I'm very sure the name is "tt". So is there anything I can do to solve this problem? Thank you very much! Lesley
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