<html><body><div style="color:#000; background-color:#fff; font-family:garamond, new york, times, serif;font-size:12pt"><div dir="ltr">hi guys</div><div dir="ltr">when i type " gate/cylindricalPET/setMaterial Water " in terminal in vGate6.2 this error occur</div><div dir="rtl" style="direction: ltr; ">" /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 "</div><div dir="ltr" style="direction: ltr; ">this command worked already!!!</div><div dir="ltr" style="direction: ltr; ">what is happened?</div><div dir="ltr" style="direction: ltr; ">thanks for your ans</div></div></body></html>