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Cannot read property 'calculateWorldAABB' of undefined


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<!DOCTYPE html>

  <script src='./node_modules/babylonjs/dist/preview release/babylon.js'></script>
  <script src='./node_modules/babylonjs/dist/preview release/cannon.js'></script>
    document.addEventListener('DOMContentLoaded', () => {
      const canvas = document.getElementById('renderCanvas')
      const engine = new BABYLON.Engine(canvas)

      const scene = new BABYLON.Scene(engine)

      const physicsHelper = new BABYLON.PhysicsHelper(scene)

      const camera = new BABYLON.ArcRotateCamera('camera', 1, 20, 10,
        new BABYLON.Vector3(20, 0, 0))
      camera.setPosition(new BABYLON.Vector3(0, 20, -30))

      const sun = new BABYLON.HemisphericLight('', new BABYLON.Vector3(0, 1, 0))
      sun.diffuse = new BABYLON.Color3(0.8, 0.8, 0.8)
      sun.groundColor = new BABYLON.Color3(0.1, 0.1, 0.1)

      const box = BABYLON.MeshBuilder.CreateBox('active', { size: 0.9 })

      const boxMaterial = new BABYLON.StandardMaterial('')
      boxMaterial.diffuseColor = new BABYLON.Color3(0.5, 0.5, 1)
      box.material = boxMaterial

      box.physicsImposter = new BABYLON.PhysicsImpostor(box,
        BABYLON.PhysicsImpostor.BoxImposter, { mass: 1, restitution: 0.9, friction: 1 })

  <canvas id='renderCanvas'></canvas>


Any ideas why this code gives the following error?


cannon.js:5756 Uncaught TypeError: Cannot read property 'calculateWorldAABB' of undefined
    at Body.computeAABB (cannon.js:5756)
    at Body.updateMassProperties (cannon.js:5930)
    at Body.addShape (cannon.js:5693)
    at t.generatePhysicsBody (babylon.js:43)
    at t.addImpostor (babylon.js:43)
    at t._init (babylon.js:43)
    at new t (babylon.js:43)
    at HTMLDocument.document.addEventListener ((index):32)

I'm using the latest GitHub code `Babylon.js engine (v3.2.0-alphaC) launched`

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