Cesium in a private Site

This page contains the code beginning with (some < and > removed):

script src=“https://cesium.com/downloads/cesiumjs/releases/1.138/Build/Cesium/Cesium.js”> <link href=“https://cesium.com/downloads/cesiumjs/releases/1.138/Build/Cesium/Widgets/widgets.css” rel=“stylesheet”

If I call the page then the Cesium 3D map will not be shown.
What is the bug?
thx in advance for your hints.
josef aka cverwalter

Off topic / for information: I have less than 10 of these Cesium maps in my private site.

From a quick look at the console, the error message is
Cesium.createWorldTerrain is not a function
and in code, there is

 var viewer = new Cesium.Viewer('cesiumContainer',{
  terrainProvider: Cesium.createWorldTerrain()
});

The createWorldTerrain function was replaced a few years ago. (Looking at the date in the URL, it’s not surprising that the code does not work with the latest version (1.138) of Cesium - it might be that the code is 10 years old, and a lot has changed in the meantime…)

Thank you very much. I looked at this and found the solution in the example listed there.