label : HeightReference.CLAMP_TO_GROUND "An error occurred while rendering."

Today I update cesium 1.47 instaed 1.43. But when I add a label with “heightReference: Cesium.HeightReference.CLAMP_TO_GROUND”, the chrome reports me the text :

An error occurred while rendering. Rendering has stopped. RuntimeError: Program failed to link. Link log: Could not pack varying v_logZ Note: Additional non-conformant packing restrictions are enforced on D3D9.

Error at new t (http://localhost:5000/libs/Cesium/1.47/Cesium.js:451:28517) at f (http://localhost:5000/libs/Cesium/1.47/Cesium.js:480:17965) at y (http://localhost:5000/libs/Cesium/1.47/Cesium.js:480:19679) at d._bind (http://localhost:5000/libs/Cesium/1.47/Cesium.js:480:20694) at G (http://localhost:5000/libs/Cesium/1.47/Cesium.js:508:913) at k.draw (http://localhost:5000/libs/Cesium/1.47/Cesium.js:508:4878) at n.execute (http://localhost:5000/libs/Cesium/1.47/Cesium.js:479:21080) at Ge (http://localhost:5000/libs/Cesium/1.47/Cesium.js:530:16825) at Xe (http://localhost:5000/libs/Cesium/1.47/Cesium.js:530:21309) at tt (http://localhost:5000/libs/Cesium/1.47/Cesium.js:530:26613)

my test code:

var viewer = new Cesium.Viewer('cesiumContainer', {
    terrainProvider: Cesium.createWorldTerrain()
});
viewer.scene.globe.depthTestAgainstTerrain = true;

var e = viewer.entities.add({
    position : Cesium.Cartesian3.fromDegrees(-122.1958, 46.1915),
     label : {
        text : 'Clamped to ground',
        heightReference : Cesium.HeightReference.CLAMP_TO_GROUND,
        horizontalOrigin : Cesium.HorizontalOrigin.CENTER,
        verticalOrigin : Cesium.VerticalOrigin.BOTTOM,
        fillColor : Cesium.Color.BLACK,
        showBackground : true,
        backgroundColor : new Cesium.Color(1, 1, 1, 0.7),
        backgroundPadding : new Cesium.Cartesian2(8, 4)
    }
});

viewer.trackedEntity = e;

[shunter]

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[cesium-concierge]

Congratulations on closing the issue! I found these Cesium forum links in the comments above:

https://groups.google.com/forum/#!topic/cesium-dev/XlaPQFwjozA

If this issue affects any of these threads, please post a comment like the following:

The issue at https://github.com/AnalyticalGraphicsInc/cesium/issues/6793 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub https://github.com/AnalyticalGraphicsInc/cesium.

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