Fatal Error when logging into Wordpress admin

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Following is the message I'm getting:

Fatal error: Call to undefined function is_user_admin() in /home/chuckr5/public_html/wp-admin/index.php on line 27

To clarify, this response comes after submitting my user name and password in the log-in screen.
Hello Seejr,

That type of error message can occur if there is a version mismatch between files, either during a failed update or hack attempt. I have replaced your wp-admin folder with a fresh one from your current version (3.0.3) You should now be able to log into the WP-admin area without issue.

I also highly recommend updating your Wordpress to the latest version for security reasons and updating again whenever WordPress releases a new update.

I hope this answers your question. If you have any more questions or information specific to the issue please leave a comment below so we can further assist you.

Best Regards,
Scott M