triggered a fatal error

If this happens try deleting and readding the plugin. Something could have gone wrong when adding the plugin the first time.
If this doesn’t help and if you are conformable with editing a WordPress file. Add
define(‘WP_DEBUG’,true);
to wp-config.php. You can add it after
* @package WordPress
*/
define(‘WP_DEBUG’,true); //goes here

Make sure there is no //, */ or /* before the define statement.

Now when you activate you should get an error message.
If you do it would be very help if you post it here.