安卓Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.String javax.xml.bind.DatatypeConverterInterface.printBase64Binary(byte[])' on a null object reference

PubResponse response = client.getAcsResponse(request);实例化这个的时候

try

    {
    String accessKey = "*";
    String accessSecret = "*";
    DefaultProfile.addEndpoint( "cn-shanghai", "Iot", "iot.cn-shanghai.aliyuncs.com");
    IClientProfile profile = DefaultProfile.getProfile("cn-shanghai", accessKey, accessSecret);
    DefaultAcsClient client = new DefaultAcsClient(profile); //初始化SDK客户端
    PubRequest request = new PubRequest();
    request.setProductKey("a17oCIdyJso");
        request.setMessageContent(android.util.Base64.encodeToString("hello world".getBytes(), android.util.Base64.DEFAULT));
    request.setTopicFullName("/a17oCIdyJso/emw3290/get");
    request.setQos(0); //目前支持QoS0和QoS1

        PubResponse response = client.getAcsResponse(request);
        System.out.println(response.getSuccess());
        System.out.println(response.getErrorMessage());
    }
    catch (ServerException e)
    {
        e.printStackTrace();
    }
    catch (ClientException e)
    {
        e.printStackTrace();
    }

大佬说了是不是空的问题，我再加一个吧