Blue globe with vue-cesium

Hi all, I’m working on this project that’s build with vue and vue-cesium. I’m a newbie on cesium.
The globe wasn’t loading at all, it was just black. After updating this cesiumPath: '' to this cesiumPath: '', and now I have a blue globe. I’m not sure how I can fix this?
You can see the project here:
Any idea how I can fix this? Thank you.