Google Search Console Missing: author Missing: entry-title Missing: updated

Hi I am getting these errors in google search console structured data. just for the main pages, posts and other pages dont have same error. https://vietnamrehberi.com/ https://vietnamrehberi.com/page/2/ https://vietnamrehberi.com/page/3/ Missing: author (4 times) Missing: entry-title Missing: updated (4 times) They said it can be because of the theme. How can i fix it? Thanks