用java sdk创建access key，却报bucket不存在的错

我用sdk连接阿里云，阿里云是公司私有化布署的。
代码如下：

  @Test
    public void createAkSk() throws Exception {
        com.aliyun.ram20150501.Client client = createClient();
        com.aliyun.ram20150501.models.CreateAccessKeyRequest createAccessKeyRequest = new com.aliyun.ram20150501.models.CreateAccessKeyRequest();
        com.aliyun.teautil.models.RuntimeOptions runtime = new com.aliyun.teautil.models.RuntimeOptions();

        com.aliyun.ram20150501.models.CreateAccessKeyResponse resp = client.createAccessKey(createAccessKeyRequest);
        System.out.println(resp);
    }

    public com.aliyun.ram20150501.Client createClient() throws Exception { 
        String accessKeyId = "xxxxx";
        String accessKeySecret = "xxxxx";
        String endPoint = "xxxxx" 

        com.aliyun.teaopenapi.models.Config config = new com.aliyun.teaopenapi.models.Config()
                .setAccessKeyId(accessKeyId)
                .setAccessKeySecret(accessKeySecret);
        config.endpoint = endPoint;
        return new com.aliyun.ram20150501.Client(config);
    }

报的错是：The specified bucket does not exist.

com.aliyun.teautil.models.TeaUtilException: Error: convert to JSON, response is:
<?xml version="1.0" encoding="UTF-8"?>
<Error>
  <Code>NoSuchBucket</Code>
  <Message>The specified bucket does not exist.</Message>
  <RequestId>66E12FDF501FD0A073F012BD</RequestId>
  <HostId>xxxxxx</HostId>
  <BucketName></BucketName>
</Error>

我没有用OSS， 为什么会报bucket不存在的错？
有人知道是什么原因吗？ 谢谢。