3D model cann't display in web

1. A concise explanation of the problem you're experiencing.

I use MicroStation construct one 3D model,then export Collada(dae)file,convert it to gltf by using collada2gltf.exe;but cann't display in webpage,when I used someothers .gltf file,it will be ok,

2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.

var model = scene.primitives.add(Cesium.Model.fromGltf({
    url : './HKworkTest.gltf',//如果为bgltf则为.bgltf
    modelMatrix : modelMatrix,
    scale : 10.0

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

I want to display my 3D model in webpage

4. The Cesium version you're using, your operating system and browser.
1.3 google

Hi there,

Could you attach the model so we can take a look?