ajithperuva

May be the issue related with htaccess.If you have any htaccess in your root directory try to correct it or remove it from.
Good luck

Mark Jaquith created this wonderful plugin called Disable Canonical URL Redirection, all you have to do is click that link, click download, and move the plugin to your plugin directory (under wp-content) and activate it, and your problem should be solved.

@n3v3rl0v3 you can add post meta by using
<?php add_post_meta($post_id, $meta_key, $meta_value, $unique); ?>
and
click here for more details.
Good Luck
??

@ikki24 Thank you so much…

replace your
require_once(‘path…\wordpress\wp-includes\plugin.php’);

with

require_once(‘path…/wordpress/wp-load.php’);
activate_plugin(‘hello.php’);