How to import addIndicators() when using ScrollMagic?

Question

JavaScript

Guys, tell me, please. I'm using ScrollMagic . The method is called to track addIndicators(). However, firstly, it shows me an error. In the console, in turn, another. Plugin import should be correct, checked the path several times. I searched the Internet for an answer, nothing helped. I don't know how to fix it anymore.

Searched the Internet, opened all the links where a similar problem is mentioned. As a result, he suffered not just a defeat, but rather a crushing defeat.

For visualization, the project was placed in a sandbox - CodeSandbox .