Warning: require(/volume2/web/RidgewayHR/wp-includes/version.php): Failed to open stream: No such file or directory in /volume2/web/RidgewayHR/wp-settings.php on line 34

Fatal error: Uncaught Error: Failed opening required '/volume2/web/RidgewayHR/wp-includes/version.php' (include_path='.:/usr/share/pear') in /volume2/web/RidgewayHR/wp-settings.php:34
Stack trace:
#0 /volume2/web/RidgewayHR/wp-config.php(92): require_once()
#1 /volume2/web/RidgewayHR/wp-load.php(50): require_once('/volume2/web/Ri...')
#2 /volume2/web/RidgewayHR/wp-blog-header.php(13): require_once('/volume2/web/Ri...')
#3 /volume2/web/RidgewayHR/index.php(3): require('/volume2/web/Ri...')
#4 {main}
  thrown in /volume2/web/RidgewayHR/wp-settings.php on line 34