Untitled

http://localhost:8090/geoserver/geog/wms?service=WMS&version=1.1.0&request=GetMap&layers=geog:ne_10m_admin_0_countries_lakes&styles=&bbox=-179.9999999999999,-89.99999999999996,180.00000000000028,83.63410065300016&width=768&height=370&srs=EPSG:4326&format=text%2Fhtml%3B%20subtype%3Dopenlayers

<!DOCTYPE html>
<html lang="en">
<head>
  <!-- Use correct character set. -->
  <meta charset="utf-8">
  <!-- Tell IE to use the latest, best version. -->
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <!-- Make the application on mobile take up the full browser screen and disable user scaling. -->
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
  <title>Hello World!</title>
  <script src="../Build/Cesium/Cesium.js"></script>
 <style>
      @import url(../Build/Cesium/Widgets/widgets.css);
      html, body, #cesiumContainer {
          width: 100%; height: 100%; margin: 0; padding: 0; overflow: hidden;
      }
  </style>
</head>
</head>
<body>
  <div id="cesiumContainer"></div>
  <script>

var widget = new Cesium.CesiumWidget('cesiumContainer');

var url='http://localhost:8090/geoserver/geog/wms';
var layers = widget.scene.globe.imageryLayers;
    layers.removeAll();
    layers.addImageryProvider(new Cesium.WebMapServiceImageryProvider({
        url : url,
        layers: 'geog:ne_10m_admin_0_countries_lakes'
    }));

Sandcastle.finishedLoading();

  </script>
</body>
</html>

Uncaught ReferenceError: Sandcastle is not defined
    at WMS.html:34

   Access to Image at 'http://localhost:8090/geoserver/geog/wms?service=WMS&version=1.1.1&request=GetMap&styles=&format=image%2Fjpeg&layers=geog%3Ane_10m_admin_0_countries_lakes&srs=EPSG%3A4326&bbox=0%2C-90%2C180%2C90&width=256&height=256' from origin 'http://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is therefore not allowed access.