terrainProvider: new Cesium.CesiumTerrainProvider({
url: "data/terrain"
}'
An error occurred in "w": Failed to obtain terrain tile X: 1 Y: 0 Level: 0.
Cesium.js:459 An error occurred in "w": Failed to obtain terrain tile X: 0 Y: 0 Level: 0.
'
If yes, i have same problem with you