running 3d building by entity API

Hello,
Please help me,

I’m using the 3d Model code sample in sandcastle but it not run correctly. I runs but don’t search for 3d models.

In this line there is error(line 40): var hpr = new Cesium.HeadingPitchRoll(heading, pitch, roll);

Error description:

Uncaught TypeError: Cesium.HeadingPitchRoll is not a constructor
at createModel (3D%20Models2.html:40)
at Object.onselect (3D%20Models2.html:64)
at HTMLSelectElement.menu.onchange (Sandcastle-header.js:57)

I attached image from error message,

This code is code from 3d model in sandcastle:

3d models @import url(../templates/bucket.css); @import url(../Build/Cesium/Widgets/widgets.css); html, body, #cesiumContainer { width: 100%; height: 100%; margin: 0; padding: 0; overflow: hidden;

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Very thanks in advance,

Sabah