Hello Rene! Rene Brun writes: > do "ResultTree1->GetCurrentFile()->AutoSave(); The TFile doesn't have an "AutoSave()" member function? Could you write the complete sequence to store the algorithm to the two files (connected to the two trees)? Something like the following? Algorithm::WriteMetadataToTrees(void) { ResultTree1->GetCurrentFile()->AutoSave(); Write(); ResultTree2->GetCurrentFile()->AutoSave(); Write(); } Ole
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