问Error code:3000 这个是什么鬼？

$cvm = QcloudApi: oad(QcloudApi::MODULE_CVM, $config);$package = array('offset' => 0, 'limit' => 3);$a = $cvm->DescribeInstances($package);if ($a === false) { $error = $cvm->getError(); echo "Error code:" . $error->getCode() . ".\n"; echo "message:" . $error->getMessage() . ".\n"; echo "ext:" . var_export($error->getExt(), true) . ".\n";} else { var_dump($a);}返回错误信息 Error code:3000.message:request falied!.ext:''.有谁知道这是什么鬼？官方提供的报错代码里没有3000这东东！