Wordpress - Fatal error: Call to undefined function...pluggable.php

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This what I see when I try to work on my website or call it up Fatal error: Call to undefined function setup_userdata() in /home/homesp10/public_html/wp-includes/pluggable.php on line 35

What do I do?
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Arn
Hello Homespun, Sorry to hear that you were having problems with the WordPress site. It took a little while to figure out what was happening, but the problem has to do with something that was affected in your wp-includes folder. Since you are currently using WordPress 3.5.1, I pulled up an original version of the includes folder from Wordpress and replaced your current one. When I did this, your website came back up with no problems. I'm not sure what you have loaded, but I strongly recommend that you update your WordPress version as soon as possible. The updates are often done in order to patch up Security issues - which may be part of the reason your site stopped working. It should be up now, sorry again for the issues that you were having! Please let us know if you require any further assistance. Regards, Arnel C.