I also encountered the same error message "cannot start session without errors", but before i reach to this point i noticed that on my "localhost/phpmyadmin/index.php" it displays a message "Cookies must be enabled past this point."(maybe this will add info) well, i checked the file "/xampp/phpmyadmin/config.inc.php" and i remember i already changed "config" to "cookie". then, i restart my xampp and still it wont work.
anyone please! thanks.