getGatewayOrder error = no Route matched with those values

[karishmapujara]

Hello

I am receiving the error in getGatewayOrder(orderid) method.

"Error: no Route matched with those values"

here is my code
try {
$response = $api->getGatewayOrder($order_id);
print_r(json_encode($response));
}
catch (Exception $e) {
print('Error: ' . $e->getMessage());
}