PHP Include

I am trying to include the member.php page with the format of my own site.

I am using
<?php include("$DOCUMENT_ROOT/amember/member.php");
?>

and getting the following error.

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /var/www/mydomain.com/html/amember/membership.php:4) in /var/www/mydomain.com/html/amember/plugins/protect/php_include/check.inc.php on line 27

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /var/www/mydomain.com/html/amember/membership.php:4) in /var/www/mydomain.com/html/amember/plugins/protect/php_include/check.inc.php on line 27


Please advise.

Chuck