plugin.qmltype problem? 3DBars example scene does not have member

gfxx

as title post, in 3dBars example qt creator show these error

Bars3D {
            id: barGraph
            x: 0
            y: 0
            width: 1135
            height: 780
            //floorLevel: qsTr("")
            horizontalAspectRatio: 1
            selectionMode: AbstractGraph3D.SelectionItem | AbstractGraph3D.SelectionRow | AbstractGraph3D.SelectionColumn | AbstractGraph3D.SelectionSlice | AbstractGraph3D.SelectionMultiSeries
            anchors.right: parent.right
            shadowQuality: AbstractGraph3D.ShadowQualityMedium
            theme: Theme3D {
                windowColor: "#c3eff6"
                labelBackgroundColor: "#c3eff6"
                backgroundColor: "#c3eff6"
                type: Theme3D.ThemePrimaryColors
                labelBorderEnabled: true
                font.pointSize: 25
                labelBackgroundEnabled: true
                colorStyle: Theme3D.ColorStyleRangeGradient
                singleHighlightGradient: customGradient

                ColorGradient {
                    id: customGradient
                    ColorGradientStop { position: 1.0; color: "#FFFF00" }
                    ColorGradientStop { position: 0.0; color: "#808000" }
                }
            }
            barThickness: 1.2
            barSpacing: Qt.size(0.6, 0.6)
            barSpacingRelative: false
            scene.activeCamera.cameraPreset: Camera3D.CameraPresetIsometricLeftHigh      // scene does not have members (M17)

not undestand why, because the property is for datavisualization 1.2 ..... and these is import in file ....
someone can suggest me the right road to find the problem?

regards

gfxx

I update the code with slider for test some property:

            scene.activeCamera.yRotation: vertSlid.value
            scene.activeCamera.xRotation: orizzSlid.value
            scene.activeCamera.zoomLevel: zoomSlid.value

It work perfect but still exist the error M17 ... why these??

It is only plugin.qmltype problem?