Hi Tommaso, This sounds like either you forgot to recompile your library against the new version of ROOT or you used a different compiler or compiler version. > Is the TLorentzVector not present in v3.03.06? Yes it is. Cheers, Philippe -----Original Message----- From: owner-roottalk@pcroot.cern.ch [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Tommaso Chiarusi Sent: Wednesday, July 03, 2002 9:18 AM To: Root Newsgroup Subject: [ROOT] about V3.03.06 Dear rooters, I tried to load the compiled classes libLastra.so and libTrack.so. I compiled them without having any problem! (And I loaded them with any problem with v3.01) But Root is giving the following error messages: root [0] .L mylib/libLastra.so dlopen error: /home/chiarusi/root/./mylib/libLastra.so: undefined symbol: Execute__7TObjectPCcT1 Load Error: Failed to load Dynamic link library /home/chiarusi/root/./mylib/libLastra.so *** Interpreter error recovered *** root [1] .L mylib/libTrack.so dlopen error: /home/chiarusi/root/./mylib/libTrack.so: undefined symbol: Execute__7TObjectPCcT1 Load Error: Failed to load Dynamic link library /home/chiarusi/root/./mylib/libTrack.so *** Interpreter error recovered *** Some hints? One othe question: Is the TLorentzVector not present in v3.03.06? Thanks, Tommaso
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