Hi Luis,
That error vaguely looks like you’re using browser imports. Are you transpiling your scripts via a bundler like webpack, or are you just loading your scripts directly in the browser? If the latter, then I would recommend checking out the ES6 tutorial for vtk.js. (Note there is currently an issue with those instructions that was resolved here: Problem when trying to setup first VTKJS project).
As for the 5th part of the course, that video wasn’t recorded due to time constraints and available personnel to cover that material. As a possible substitute in the interim, I can highly recommend webgl2fundamentals if you wish to understand more of the underlying WebGL tech and GLSL shader code.