# I got Error while playing with sandcastle polyline CZML example **URL:** \ **Category:** CesiumJS\ **Created:** [October 17, 2018, 4:48am UTC](https://community.cesium.com/t/i-got-error-while-playing-with-sandcastle-polyline-czml-example/7570 "2018-10-17T04:48:25Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![alifut22](https://avatars.discourse-cdn.com/v4/letter/a/6f9a4e/32.png) [@alifut22](https://community.cesium.com/u/alifut22)\ **Post date:** [October 17, 2018, 4:48am UTC](https://community.cesium.com/t/i-got-error-while-playing-with-sandcastle-polyline-czml-example/7570/1 "2018-10-17T04:48:25Z")
Hi, While playing with the Sandcastle CZML Polyline example I got the following error: "An error occurred while rendering. Rendering has stopped. undefined DeveloperError: normalized result is not a number Error     at new DeveloperError ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:540:19](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:540:19))     at Function.Cartesian3.normalize ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:8146:19](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:8146:19))     at rotateVertical ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:187871:28](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:187871:28))     at Camera.rotateUp ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:187862:9](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:187862:9))     at rotate3D ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:233802:20](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:233802:20))     at tilt3DOnEllipsoid ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:234041:9](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:234041:9))     at tilt3D ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:233983:13](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:233983:13))     at reactToInput ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:232785:21](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:232785:21))     at update3D ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:234314:9](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:234314:9))     at ScreenSpaceCameraController.update ([https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:234347:13](https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:234347:13))" While playing with the example I choose "Cesium World Terrain" in the baseLayerPicker widget. link to the example: > **[Cesium Sandcastle](https://sandcastle.cesium.com/?src=CZML%20Polyline.html)** > > The Cesium Sandcastle provides an interactive environment for testing Cesium code. ---
**Author:** ![omar](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/omar/32/1999_2.png) [@omar](https://community.cesium.com/u/omar)\ **Post date:** [October 18, 2018, 7:51pm UTC](https://community.cesium.com/t/i-got-error-while-playing-with-sandcastle-polyline-czml-example/7570/2 "2018-10-18T19:51:54Z")
Does this happen as soon as you choose world terrain,or just when you move around in general? If it’s the latter, I think you might be running into this issue: > > > Brought up in this forum thread. > Try holding ctrl and rotating with left mouse click in this Sandcastle. If you get the... ---
**Author:** ![alifut22](https://avatars.discourse-cdn.com/v4/letter/a/6f9a4e/32.png) [@alifut22](https://community.cesium.com/u/alifut22)\ **Post date:** [October 23, 2018, 11:00am UTC](https://community.cesium.com/t/i-got-error-while-playing-with-sandcastle-polyline-czml-example/7570/3 "2018-10-23T11:00:18Z")
Just when I moved around in general. Thanks. ---
**Author:** ![omar](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/omar/32/1999_2.png) [@omar](https://community.cesium.com/u/omar)\ **Post date:** [October 24, 2018, 6:47pm UTC](https://community.cesium.com/t/i-got-error-while-playing-with-sandcastle-polyline-czml-example/7570/4 "2018-10-24T18:47:15Z")
Yeah it’s definitely something I’d love to see fixed. I’ll bump the GitHub issue so the team is aware it’s still a problem.