Uncaught TypeError: r.n is not a constructor

Ionic Framework ionic-v3
1

I am getting the following error while serving my ionic app.

Uncaught TypeError: r.n is not a constructor
    at Object.<anonymous> (VM64 vendor.js:1)
    at e (VM64 vendor.js:1)
    at Object.<anonymous> (VM64 vendor.js:1)
    at e (VM64 vendor.js:1)
    at Object.235 (VM65 main.js:393)
    at e (VM64 vendor.js:1)
    at Object.<anonymous> (VM64 vendor.js:1)
    at e (VM64 vendor.js:1)
    at Object.<anonymous> (VM64 vendor.js:1)
    at e (VM64 vendor.js:1)

and


GET http://localhost:8100/assets/fonts/roboto-regular.woff2 404 (Not Found)

What might be the error?