Erro ao editar arquivo do tema ou ao fazer logout

Ao fazer logout ou salvar algum aquivo olha o erro:

Warning: Cannot modify header information – headers already sent by (output started at /home/admin/public_html/site/wp-content/themes/Cumari_/functions.php:1) in /home/admin/public_html/site/wp-includes/pluggable.php on line 896

segue meu arquivo functions.php:

<?php
if (function_exists(‘register_sidebar’))
{
register_sidebar(array(
‘name’ => ‘Menu’,
‘before_widget’ => ‘<div class=”widget”>’,
‘after_widget’ => ‘</div>’,
‘before_title’ => ‘<h3>’,
‘after_title’ => ‘</h3>’,
));
register_sidebar(array(
‘name’ => ‘Sidebar_left’,
‘before_widget’ => ‘<div class=”widget”>’,
‘after_widget’ => ‘</div>’,
‘before_title’ => ‘<h3>’,
‘after_title’ => ‘</h3>’,
));
}
?>

ja verifiquei ate o plugabe fiz tudo.Alguma dica?