WP Post Template – Templates in own folder

Use php dot notation.
Try:

$my_templates = get_stylesheet_directory() . '/lp/';
$base = array( trailingslashit(get_template_directory()), $my_templates );

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)