This plugin doesn't work with Invicta Theme

Hello, I have this plugin in my website but it doesn’t work. I can select the multiple authors but in the web it doesn’t appear.
I have Invicta WordPress theme (http://themes.oitentaecinco.com/invicta/)

I change in blog-entry.php the code, and I put this one:

<?php if ( function_exists( 'coauthors_posts_links' ) ) {
    coauthors_posts_links();
} else {
    the_author_posts_link();
} ?>

Any help? Thank you so much.

https://ww.wp.xz.cn/plugins/co-authors-plus/