Error when running visjs example

[Peter-8960]

I git visjs-network and run npm install and npm run build to compile the source files. Everything looks fine. However, when open the example in the browser, vis.js does not work. There is a error message:
TypeError: propagating is not a function. (In 'propagating(Hammer, {
preventDefault: 'mouse'
})', 'propagating' is an instance of Object)

does anyone know what is the reason?
thanks!