narendrakothule on "[Plugin: WordPress SEO by Yoast] WARNING: Duplicate Meta Descriptions and Title Tags when Paginating"

I am facing problem for comment paging. webmaster gives error for duplicate meta titles & desc.

i tried adding %%page%% & %%pagenumber%% in article type. but not adding comment page number
My URL is like http://www.sitename.com\pagetitle\comment-page-4

i tried
if ( ! function_exists( 't5_add_page_number' ) )
{
function t5_add_page_number( $s )
{
global $page,$cpage;
if($cpage > 0)
$s = $s.'comment-page:'.$cpage;
return $s;
$s = "";
}

add_filter( 'wp_title', 't5_add_page_number', 100, 1 );
add_filter( 'wpseo_metadesc', 't5_add_page_number', 100, 1 );
}

this is working for desc but not for title.

Any idea or suggestions ?
thx in adv.