I am trying to install my own theme & it won't work!

Hello,

WordPress is new to me. I have been following a tutorial book.

You can see the site at greentest1.co.uk

In the dashboard area I get the following error message:
Warning: Cannot modify header information – headers already sent by (output started at /home/greentes/public_html/wp-content/themes/greentheme/functions.php:5) in /home/greentes/public_html/wp-includes/option.php on line 563 ‘

Line 5 of functions.php is the following:

register_sidebar ( array( ‘id’ => ‘primary’, ‘name’ => _( ‘primary’ ), ‘description’ => _(‘This is the primary sidebar.’), ‘before_widget’ => ‘<div id=”%1$s” class=”widget%2$s”>’, ‘after_widget’ => ‘</div>’, ‘before_title’ => ‘<h3 class=”widget-title”> ‘, ‘after_title’ => ‘</h3>’ ) ); } ?>

Do you have any suggestions how I can solve this? I have been following a visual basic book.

Thanks ??