Hi!
I had the same problem and I solved it doing:
source /afs/cern.ch/sw/lcg/external/gcc/4.9/x86_64-slc6-gcc49-opt/setup.sh
source /afs/cern.ch/sw/lcg/app/releases/ROOT/6.06.08/x86_64-slc6-gcc49-opt/root/bin/thisroot.sh
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You solved my problem! Thank you so much! I think it’s essential to use a proper root version.