Problem with the WordPress Integration - Only mirroring Home Page

Hi, all -
I’m trying to publish a website using the API for the WordPress Integration.

The problem is that only the home page is being mirrored. The inside pages (e.g /main-portfolio) gives me the following message:

Would anyone know how to fix it?
I’ve used the integration on another site and is worked perfectly fine. I’ve already regenerated the API code, and reset it multiple times.

Many thanks!