调用物的自定义服务，一直返回 500错误，紧急！跪求！多谢了！

1. 调用物的自定义服务，一直返回 500错误，
具体错误信息：content = {"code":500,"id":"121121212","localizedMsg":"服务异常","message":"service provider exception."}
以下是部分代码，还请牛人看看啥问题，多谢了！
2. 自定义方法调用中的method对应TSL文件中的identifier字段指（"identifier": "testAsync"）吗？

"services": [
        {
            "outputData": [],
            "identifier": "testAsync",
            "inputData": [
                {
                    "identifier": "num",
                    "dataType": {
                        "specs": {
                            "min": "0",
                            "max": "100"
                        },
                        "type": "int"
                    },
                    "name": "测试"
                }
            ],
            "method": "thing.service.testAsync",
            "name": "testAsync",
            "required": false,
            "callType": "sync"
        }
    ],



IoTApiRequest request = new IoTApiRequest();
        //设置api的版本
        request.setApiVer("1.1.0");
        request.setId("121121212");
        
        JSONObject obj = new JSONObject();
        obj.put("num", 20);
        String cmd = obj.toString();
        
        // 接口参数
        request.putParam("productKey", productKey);
        request.putParam("inputParams", cmd);
        request.putParam("method", "testAsync");
        request.putParam("deviceName", deviceName);
        
        ApiResponse response = syncClient.postBody("api.link.aliyun.com", "/thing/device/service/invoke", request, true);