I need to fix an error in Google Search Console

I'm getting an error in Google Search Console saying:

Invalid object type for field 'author'

It appears on all posts that have comments.

The specific code with the issue is:

Titus

There is also a secondary issue: 'Comment' object must be nested inside a 'CreativeWork' object.

I need someone to fix both these issues.

Here is an example page: https://anywhereweroam.com/things-to-do-in-iceland/