[Gate-users] Problem with Vgate

[Hanieh]

Hello dears,
I'm working with Vgate 3.0, since a week I have had a graphic problem. I designed my scanner(Siemens biograph 6 PET scanner). When I run gate, I have a black window in the viewer and I get this message in the terminal( I attached one file to show my error)
Does anyone have an idea how I can solve my problem?

Best regards 
Hanieh jozi
Bio medical  radiation engineer 

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