Unhandled exception issue when adding a module in UE4 version 4.261

I practiced adding modules based on the content of the legacy wiki(https://ue4community.wiki/creating-cpp-module-oshdsg2t), but I keep getting an unhandled exception problem. How do I solve this?

What I want to put in is the Dialogue System, and I am practicing based on this content (UE4 Dialogue System Part2 — Jinyu Liao's Blog).

Plz Help me…

You cant use // comments in json file.