[Gate-users] about vGate

[narjes BEN AMEUR]

 Hi 
 I have a problem with vGate, at the starting with terminal to launch benchmarks 
or examples.
 i installed the vGate on my pc with virtual box (oracle VM) but couldn't run 
any program, i couldn't run the benchmarks or examples such as SPECT or PET.
 
 when i use the command line :
 /Gate/cylindricalPET/setMaterial Water
 the system gives this answer :
 src/GateMaterialDatabase.cc (L 126): GateMaterialDatabase:could not find the 
definition for material 'Water' in material files

 please help me to solve this problem
 thanks