Update App.js

public/App.js

@@ -63,7 +63,7 @@ var initialPosition = Cesium.Cartesian3.fromDegrees(16.368084, 48.183257, 360);
 
     var building = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({url: 'https://w2.iaf.hft-stuttgart.de/CesiumData/3DTiles/Buildings/BuildingSolid/Meidling_Vienna/tileset.json'}));
 	var outdoorbuildinginstallation = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({url: 'https://w2.iaf.hft-stuttgart.de/CesiumData/3DTiles/Buildings/BuildingInstallation/Meidling_Vienna/tileset.json'}));
-	var roofsurface = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({url: 'https://w2.iaf.hft-stuttgart.de/CesiumData/3DTiles/Buildings/RoofSurface/Mediling_Vienna/tileset.json'}));
+	var roofsurface = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({url: 'https://w2.iaf.hft-stuttgart.de/CesiumData/3DTiles/Buildings/RoofSurface/Meidling_Vienna/tileset.json'}));
 	var roofdefaultstyle = new Cesium.Cesium3DTileStyle({color : "color('#990000')"});
 		roofsurface.style = roofdefaultstyle;
       // set roof height and load roof tile