I cannot see the first warning as it is cut off.
We have seen the second warning occur and it should not affect functionality on your page. To fix it, you can set your Warning Level to None in Joomla Global Configuration or edit the file it mentioned /components/com_jfbconnect/libraries/provider/facebook.php around line 299 and comment out the following:
if ($user->guest)
setcookie('jfbconnect_permissions_granted', '', time() - 10000, "/"); // clear the granted permissions cookie