Custom Post Type Adds Page during activation generates " headers already sent "

function employee_plugin_activate(){
$newpage= 'Employee Archive';
if(get_page_by_title('Employee Archive') == false ){
$my_page = array(
	'post_title' => 'Employee Archive',
	'post_content' => 'IT WORKS',
	'post_status' => 'publish',
	'post_type' => 'page',
	'post_author' => 1
);
	$post_id = wp_insert_post($my_page);
	//wp_insert_post($my_page);
}//end if
}//end function
register_activation_hook( __FILE__, 'employee_plugin_activate' );

/**************************************/

//Load Employee Archive template for page Movie Reviews Archive
add_filter( 'page_template', 'emp_load_template' );
function emp_load_template( $page_template )
{
    if ( is_page( 'Employee Archive' ) ) {
        $page_template = plugin_dir_path( __FILE__ ) . '/page-employees.php';
    }
    return $page_template;
}

This first block of code throws a ” Headers already sent error ” during plugin activation. Please help.