Solved Issue : just to help others if they bump into the same issue - the solution was to configure the S3 Static website hosting to direct Errors to index.html.
We talk about this step in this chapter:
In the “Handling Errors” section, the text says
“To do that, add the following to src/libs/errorLib.js.”
Except errorLib.js hasn’t been created.
The code works, it’s just awkward. If your not familiar with the finished code, so you need anything else like in the contextLib.js?
We should tweak the wording there. It just means to create the errorLib.js file with that.