If you are using Feedreader but unable to see any feeds, try playing with line numbers 4 and 7 in the feed.php file. You can find that file at /modules/mod_feedreaderjp/feed.php.

Instead of using the following server variable on these lines, replace them with either a relative path or an absolute path: 

$_SERVER['DOCUMENT_ROOT']

The  lines will look like this in the feed.php file:

Line 4 

require($_SERVER['DOCUMENT_ROOT'] . '/modules/mod_feedreaderjp/php/simplepie.inc'); 

 Line 7

$feed->cache_location($_SERVER['DOCUMENT_ROOT'] . '/modules/mod_feedreaderjp/cache');

If you are using Feedreader in a subfolder in Joomla then you will need to change the path like this:

require($_SERVER['DOCUMENT_ROOT'] . '/sub_folder/modules/mod_feedreaderjp/php/simplepie.inc');

and

$feed->cache_location($_SERVER['DOCUMENT_ROOT'] . '/sub_folder/modules/mod_feedreaderjp/cache');

 Also make sure that the cache folder in  /modules/mod_feedreaderjp/cache is server-writable.