[Gate-users] help for material in gate

[Mohsen Sadat shahabi]

HELLO gaters
I am a new user
I have a virtual gate v2.1 and write in terminal "/gate/geometry/setMaterialDatabase MyMaterialDatabase.db" and application answer is 
-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : GateMDBFile
      issued by : GateMDBFile::GateMDBFile
Could not find material database file 'MyMaterialDatabase.db'
*** Fatal Exception *** core dump ***
-------- EEEE -------- G4Exception-END --------- EEEE -------

*** G4Exception: Aborting execution ***
Aborted (core dumped)

what is happened?
I had replaced "MyMaterialDatabase.db" by "myGateMaterials.db" and "GateMaterials.db" that exist in gate_v6.2 directory but answer was same.
please help me
best regards
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20130510/8146a2f9/attachment.html>