Loading Specific Blog in WPMU

i am unable to load specific blog in wpmu

require_once '../wp-load.php';

switch_to_blog(3);

do_action('init');

echo "<pre>";
print_r(get_post_types());
echo "</pre>";

var_dump(taxonomy_exists('biot_news_cat'));

Actually i am making a Cron and in which i want to use the WP Functions
so using wp-load.php i am done that but i have define some custom post type and taxonomies in my functions.php file which are not getting load during this operation

and due to that when i am trying to insert new post with taxonomy it gives me invalid taxonomy error