I am using:
var osm = new Cesium.createOpenStreetMapImageryProvider({
url : '[https://a.tile.openstreetmap.org/](https://a.tile.openstreetmap.org/)'
});
this.viewer.imagerLayers.addImageryProvider(osm)
I am getting the following error:
ERROR TypeError: Cesium.createOpenStreetMapImageryProvider is not a constructor