Jason Ho on "Problem with last_post_redirect_load_plugin_textdomain!"

Hi,
i want to use last_post_redirect_load_plugin_textdomain on a plugin
but when i use code

$plugin_wp_content_plugin_dir = dirname(plugin_basename( __FILE__ ));

function last_post_redirect_load_plugin_textdomain() {
	global $plugin_wp_content_plugin_dir;
	load_plugin_textdomain('last-post-redirect', false, $plugin_wp_content_plugin_dir.'/lang/');
}
add_action('plugins_loaded', 'last_post_redirect_load_plugin_textdomain');

It didn't work.(echo __("111", 'last-post-redirect'); it should be 222)
My Wordpress is zh_TW and the file in lang/ is last-post-redirect-zh_TW.mo and last-post-redirect-zh_TW.po
HELP!