无法读取在处未定义的属性“extractUrlBase”FBXLoader.load加载程序

我正在尝试在web浏览器中加载fbx文件,使用三.js.

const objs = [];
const loader = new THREE.FBXLoader();
loader.load('/models/fbx/Handgun.fbx', model => {
    // model is a THREE.Group (THREE.Object3D)                              
    const mixer = new THREE.AnimationMixer(model);
    // animations is a list of THREE.AnimationClip                          
    mixer.clipAction(model.animations[0]).play();
    scene.add(model);
    objs.push({model, mixer});
});

代码正在引发以下常量错误:

在FBXLoader.load加载程序(FBXLoader.js:43)