Hi, I have run into a problem when reading trees from a file with a program rather than in a macro. I am using the event example from the test area and I have created the event.root file. I modified MainEvent.cxx and removed everything in the write case ( the "else {" part of "if read == 1)"). I get the following output: bash.exe-2.02$ Event 100 0 0 20 TFile** Event.root TFile* Event.root KEY: TH1F htime;1 Real-Time to write versus time KEY: TTree T;1 An example of a ROOT tree KEY: TH1F hstat;1 Event Histogram Error in <TKey::ReadObj>: Unknown class TTree What is going on? How can TKey not know about TTrees? Reading the tree works fine with the unmodified MainEvent.cxx routine. That is puzzling, because I only removed parts that don't get called. I am running on Windows NT with ROOT 2.23/11. Thanks for any help, Reinhard
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