Since you appear to have it installed into your home directory, this path:
/home/rondi/public_html//wp-content/plugins/content-gallery/gallery.php
probably does not exist. I’m assuming line 15 of home.php might need to be changed to:
wp-content/plugins/content-gallery/gallery.php
It certainly appears to be a -path- issue of some sort.
Hope it helps.
-Jim
