Error Message

Hi,

I have been trying to use my website but when i go to the admin page it shows this message: “Fatal error: Cannot redeclare class Custom_Image_Header in /home/booksfor/public_html/wp-admin/custom-header.php on line 16”.

Please help me resolve this. Every time i update the software to version 3.1 it comes up with this message.

My website is: bookforme.com.au/wp-admin

Regards,

Booksforme.com.au