Fatal Errors

Hey guys can anyone help me fix this error message = Warning: require(/home/reggae/public_html/wp-includes/class-wp-block-parser.php): failed to open stream: No such file or directory in /home/reggae/public_html/wp-settings.php on line 251

Fatal error: require(): Failed opening required ‘/home/reggae/public_html/wp-includes/class-wp-block-parser.php’ (include_path=’.:/opt/php54/lib/php’) in /home/reggae/public_html/wp-settings.php on line 251
I am wordpress beginner so this new to me

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