问用java sdk 3调用“一句话识别”接口不成功，报错InternalError 。。。？

        String secretId = ApplicationProperties.getByKey("tencent.cloud.secretId").trim();
        String secretKey = ApplicationProperties.getByKey("tencent.cloud.secretKey").trim();

        // 实例化一个认证对象，入参需要传入腾讯云账户secretId，secretKey
        Credential cred = new Credential(secretId, secretKey);

        // 实例化一个http选项，可选的，没有特殊需求可以跳过
        HttpProfile httpProfile = new HttpProfile();
        httpProfile.setReqMethod("POST"); // post请求(默认为post请求)
        httpProfile.setConnTimeout(30); // 请求连接超时时间，单位为秒(默认60秒)
        httpProfile.setEndpoint("aai.tencentcloudapi.com"); // 指定接入地域域名(默认就近接入)

        // 实例化一个client选项，可选的，没有特殊需求可以跳过
        ClientProfile clientProfile = new ClientProfile();
        clientProfile.setSignMethod("HmacSHA256"); // 指定签名算法(默认为HmacSHA256)
        clientProfile.setHttpProfile(httpProfile);

        // 实例化要请求产品(以cvm为例)的client对象
        AaiClient client = new AaiClient(cred, "ap-guangzhou", clientProfile);

        // 实例化一个请求对象
        SentenceRecognitionRequest req = new SentenceRecognitionRequest();
        req.setProjectId(0);
        req.setSubServiceType(2);
        req.setEngSerViceType("8k");
        req.setSourceType(1);
        req.setVoiceFormat("mp3");
        req.setUsrAudioKey(UUID.randomUUID().toString());

//        BASE64Encoder encoder = new BASE64Encoder();
        FileInputStream inputFile = new FileInputStream(file);
        byte[] buffer = new byte[(int) file.length()];
        inputFile.read(buffer);
        inputFile.close();
        String base64 = new BASE64Encoder().encode(buffer);

        req.setData(base64);
        req.setDataLen(base64.length());

        // 通过client对象调用想要访问的接口，需要传入请求对象
        SentenceRecognitionResponse resp = client.SentenceRecognition(req);

        String ret = SentenceRecognitionRequest.toJsonString(resp);