TypeError: Cannot read property 'undefined' of undefined ( Cesium1.82.1)

code: ` import * as Cesium from 'cesium'; import "../../node_modules/cesium/Build/Cesium/Widgets/widgets.css";

this.viewer = new Cesium.Viewer(this.mapId, this.options);

var tileset = this.viewer.scene.primitives.add(new Cesium.Cesium3DTileset({ url : '//resource.dvgis.cn/data/3dtiles/ljz/tileset.json' })); `

got: `

Cesium.js:315709 An error occurred while rendering. Rendering has stopped. TypeError: Cannot read property 'undefined' of undefined TypeError: Cannot read property 'undefined' of undefined at Object.webpack_modules__../node_modules/cesium/Build/CesiumUnminified/Cesium.js.ModelUtility.computeBoundingSphere (http://localhost:8080/spgis.js:177756:32) at Model.webpack_modules../node_modules/cesium/Build/CesiumUnminified/Cesium.js.Model.update (http://localhost:8080/spgis.js:195874:47) at Gltf3DTileContent.__webpack_modules../node_modules/cesium/Build/CesiumUnminified/Cesium.js.Gltf3DTileContent.update (http://localhost:8080/spgis.js:198514:11) at Cesium3DTile.webpack_modules__../node_modules/cesium/Build/CesiumUnminified/Cesium.js.Cesium3DTile.process (http://localhost:8080/spgis.js:235647:19) at processTiles (http://localhost:8080/spgis.js:239937:16) at Cesium3DTileset.webpack_modules../node_modules/cesium/Build/CesiumUnminified/Cesium.js.Cesium3DTileset.prePassesUpdate (http://localhost:8080/spgis.js:239799:5) at PrimitiveCollection.__webpack_modules../node_modules/cesium/Build/CesiumUnminified/Cesium.js.PrimitiveCollection.prePassesUpdate (http://localhost:8080/spgis.js:256154:19) at prePassesUpdate (http://localhost:8080/spgis.js:345481:16) at tryAndCatchError (http://localhost:8080/spgis.js:345578:7) at Scene.__webpack_modules__../node_modules/cesium/Build/CesiumUnminified/Cesium.js.Scene.render (http://localhost:8080/spgis.js:345647:5) `

and why? thanks!