Qt3D problem

[html4eto]

In this code

import QtQuick 1.0
import Qt3D 1.0
 
Viewport {
    width: 640; height: 480
    Item3D {
        id: teapot
        mesh: Mesh { source: "teapot.bez" }
        effect: Effect {}
    }
}

import QtQuick 1.0
import Qt3D 1.0

Viewport {
    width: 640; height: 480
    Item3D {
        id: teapot
        mesh: Mesh { source: "teapot.bez" }
        effect: Effect {}
    }
}

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i have that error

GL graphics system is not active; cannot use 3D items

GL graphics system is not active; cannot use 3D items

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