ReferenceError: WikitudePlugin is not defined

Ionic Framework ionic-v3
1

I Have this error

Error: Uncaught (in promise): ReferenceError: WikitudePlugin is not defined
ReferenceError: WikitudePlugin is not defined
    at http://localhost:8100/build/main.js:104619:13
    at t.invoke (http://localhost:8100/build/polyfills.js:3:14529)
    at Object.onInvoke (http://localhost:8100/build/main.js:4424:37)
    at t.invoke (http://localhost:8100/build/polyfills.js:3:14469)
    at n.run (http://localhost:8100/build/polyfills.js:3:9741)

and many more

2

What is the code that is causing this?
Are you using a starter project or template?

3

I am using starter project. Im following this tutorial for Augmented Reality