Fatal Error with my WordPress Site

Hello my website just crashed all of a sudden. I need help with this. I don’t want all my hard work to be gone out of nowhere!

The website is garfieldstips.com

It says:

Warning: require(/home2/miho/public_html/garfieldstips.com/wp-includes/pluggable.php): failed to open stream: No such file or directory in /home2/miho/public_html/garfieldstips.com/wp-settings.php on line 309

Fatal error: require(): Failed opening required ‘/home2/miho/public_html/garfieldstips.com/wp-includes/pluggable.php’ (include_path=’.:/opt/php54/lib/php’) in /home2/miho/public_html/garfieldstips.com/wp-settings.php on line 309

Thanks in advance!

The page I need help with: [log in to see the link]