WP-Settings.php MAJOR problem

Hi,

I’m not fully sure on what has happened but if you examine a page on my site (for example https://www.trulyrandom.net/wp-admin/) it comes up with the following error.

=====ERROR=====
Warning: require(/home/truljoh9/public_html/wp-includes/compat.php) [function.require]: failed to open stream: No such file or directory in /home/truljoh9/public_html/wp-settings.php on line 202

Fatal error: require() [function.require]: Failed opening required ‘/home/truljoh9/public_html/wp-includes/compat.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/truljoh9/public_html/wp-settings.php on line 202
=====ERROR=====

Any Help Would Be Great! ??
Thanks, Dan