Problems with new payment module

[client xx.xx.xx.xx] PHP Warning: reset(): Passed variable is not an array or object in /server/path/to/store_admin/modules.php on line 278, referer: http://mysite/store_admin/modules.php?set=payment&module=new_module 
[client xx.xx.xx.xx] PHP Warning: Variable passed to each() is not an array or object in /server/path/to/store_admin/modules.php on line 279, referer: http://mysite/store_admin/modules.php?set=payment&module=new_module

    function keys() {
      return array('MODULE_PAYMENT_NEW_MODULE_STATUS', 'MODULE_PAYMENT_NEW_MODULE_ID', 'MODULE_PAYMENT_NEW_MODULE_REFERRAL_ID', 'MODULE_PAYMENT_NEW_MODULE_LOGO', 'MODULE_PAYMENT_NEW_MODULE_DEFAULT_CURRENCY', 'MODULE_PAYMENT_NEW_MODULE_USER_CURRENCY', 'MODULE_PAYMENT_NEW_MODULE_DEFAULT_LANGUAGE', 'MODULE_PAYMENT_NEW_MODULE_LANGUAGE', 'MODULE_PAYMENT_NEW_MODULE_TRANSACTION_ID_PREFIX', 'MODULE_PAYMENT_NEW_MODULE_SORT_ORDER', 'MODULE_PAYMENT_NEW_MODULE_ZONE', 'MODULE_PAYMENT_NEW_MODULE_ORDER_STATUS_ID');
    }    

$db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Default Currency', 'MODULE_PAYMENT_NEW_CURRENCY', 'EUR', 'Your default currency', '6', '5', 'zen_cfg_pull_down_new_currency', now())");