authorize.net cim使用php-sdk空响应数组，没有错误

我从authorize.net得到一个空数组响应，没有任何错误。

AuthorizeNetCIM_Response对象（[xml]=>[Response]=>）

我正在使用新的php-sdk。这是我的代码

//authorizenet configuration        
define("AUTHORIZENET_API_LOGIN_ID",'');
define("AUTHORIZENET_TRANSACTION_KEY",'');
define("AUTHORIZENET_SANDBOX",true);
//Create new customer profile
$request                             = new AuthorizeNetCIM;
$customerProfile                     = new AuthorizeNetCustomer;
$customerProfile->description        = "Bar Express Customer";
$customerProfile->email              = "a97eehdhd@gmail.com";
$response =$request->createCustomerProfile($customerProfile); 
if ($response->isOk()) {
    $customerProfileId = $response->getCustomerProfileId();
}
echo print_r($response);