Missing argument 5 for Add_New_Default_Avatar::get_avatar()

hi,

i have the same problem, where exactly did paste $alt=false

function get_avatar( $avatar, $id_or_email, $size, $default='', $alt ) {

		if ( is_numeric( $id_or_email ) ) {
			$email = get_userdata( $id_or_email )->user_email;
			$user_id = (int) $id_or_email;
		}
		elseif ( is_object( $id_or_email ) ) {
			$email = $id_or_email->comment_author_email;
			$user_id = (int) $id_or_email->user_id;
		}
		elseif ( is_string( $id_or_email ) && ( $user = get_user_by( 'email', $id_or_email ) ) ) {
			$email = $id_or_email;
			$user_id = $user->ID;
		}

		// special exception for our 10up friends
		// http://wordpress.org/extend/plugins/simple-local-avatars/
		// (and check hook suffix while we're at it, if the current user has a simple_local_avatar, it'll throw the list off)
		$local_avatars = get_user_meta( $user_id, 'simple_local_avatar', true );
		if ( ! empty( $local_avatars ) && ( isset( $GLOBALS['hook_suffix'] ) && $GLOBALS['hook_suffix'] != 'options-discussion.php' ) ) {
			remove_filter( 'get_avatar', array( &$this, 'get_avatar' ), 88, 5 );
			return $avatar;
		}

		// since we're hooking directly into get_avatar,
		// we need to make sure another avatar hasn't been selected
		/* Once upon a time was needed for Mr WordPress. Do we care?
		$direct = get_option('avatar_default');
		if ( strpos( $default, $direct ) !== false ) {
			$email = empty( $email ) ? 'nobody' : md5( $email );

			// in rare cases were there is no email associated with the comment (like Mr WordPress)
			// we have to work around a bit to insert the custom avatar
			// 'www' version for WP2.9 and older
			if ( strpos( $default, 'http://0.gravatar.com/avatar/') === 0 || strpos( $default, 'http://www.gravatar.com/avatar/') === 0 )
				$avatar = str_replace( $default, $direct, $avatar );

		}
		*/
		// hack the correct size parameter back in, if necessary
		$avatar = str_replace( '%size%', $size, $avatar );
		$avatar = str_replace( urlencode('%size%'), $size, $avatar );
		return $avatar;
	}