1. What version of PHP are you running? If you're using anything prior to 5.3, the __DIR__ syntax will not work. In components/com_jfbconnect/jfbconnect.php around line 15, can you try replacing
require_once (__DIR__ . '/controller.php');
with
require_once (dirname(__FILE__) . '/controller.php');
2. Please verify that the file permissions and owners on the files in the com_jfbconnect folders are correct.
-Melissa