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Hello everyone, I hope you had great holidays! I am back at work now and found these new materials very interesting. While implementing the new "sky material", I encountered the following error: File: /dist/babylon.skyMaterial.js this._effect = scene.getEngine().createEffect(shaderName, attribs, ["world", "viewProjection", "vFogInfos", "vFogColor", "pointSize", "vClipPlane", "luminance", "turbidity", "rayleigh", "mieCoefficient", "mieDirectionalG", "sunPosition" ], [], join, fallbacks, this.onCompiled, this.onError); } if (!this._effect.isReady()) { // <=== this._effect is null, therefore error "isReady of null" return false; } this._renderId = scene.getRenderId(); this._wasPreviouslyReady = true;this._effect.isReady() throws an error because this._effect is null. What's the problem here? Thanks Kevin