[Gate-users] water not found

[Mohsen Sadat shahabi]

hi guys
when i type " gate/cylindricalPET/setMaterial Water " in terminal in vGate6.2 this error occur
" /home/gate/Progs/Gate/gate_v6.2/source/geometry/src/GateMaterialDatabase.cc (l.132): GateMaterialDatabase: could not find the definition for material 'Water' in material files  "
this command worked already!!!
what is happened?
thanks for your ans
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