New module – now no products will display

I am trying to extending the Grouped Product using this as a guide:

The end result is so that I can access the custom attributes of associated products on a grouped product page.

However, after added the new module/plugin using the github link referenced, now any product I try to open I get a 404 not found message.

Not sure how to evaluate what the problem is or reverse course on this.

Can anyone provide some guidance?

submitted by /u/davidbarman
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