Having Issues with updating

I’m having issues with my wordpress upgrading.
I tried to upload manually. deleted and uploaded “wp-includes” and “wp-admin” then overwrote the “wp-content”.
Now It’s showing me this fatal error.
“Warning: require(/home/kurb/public_html/piratesofauckland/wp-includes/classes.php) [function.require]: failed to open stream: No such file or directory in /home/kurb/public_html/piratesofauckland/wp-settings.php on line 209

Fatal error: require() [function.require]: Failed opening required ‘/home/kurb/public_html/piratesofauckland/wp-includes/classes.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/kurb/public_html/piratesofauckland/wp-settings.php on line 209″
Please Help me out.
This is the site I’m working with: https://piratesofauckland.info/