遍历操作，执行时报错hrpc.exceptions.RpcRemoteException: java.lang.ClassCastException: com.netease.open.libpoco.Node cannot be cast to java.util.Map

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**描述问题bug**
遍历操作，执行时报错
hrpc.exceptions.RpcRemoteException: java.lang.ClassCastException: com.netease.open.libpoco.Node cannot be cast to java.util.Map

具体报错log:
[Start running..]
no cmdline args
[17:28:53][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe devices
[17:28:53][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe devices
[17:28:53][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe -s DB5322AR40256 wait-for-device
[17:28:53][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe -s DB5322AR40256 shell getprop ro.build.version.sdk
[17:28:53][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe -s DB5322AR40256 shell dumpsys activity top
[17:28:53][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe -s DB5322AR40256 shell dumpsys package com.netease.open.pocoservice
[17:28:53][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe -s DB5322AR40256 forward --no-rebind tcp:17809 tcp:10080
[17:28:53][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe -s DB5322AR40256 forward --no-rebind tcp:13877 tcp:10081
Traceback (most recent call last):
File "D:\MaxApp\test_cases\tests_sunmi_AndroidApk\debug.py", line 256, in
for cashierList in cashierLists:
File "C:\Users\admin\AppData\Local\Programs\Python\Python39\lib\site-packages\poco\proxy.py", line 294, in __iter__
length = len(nodes)
File "C:\Users\admin\AppData\Local\Programs\Python\Python39\lib\site-packages\hrpc\object_proxy.py", line 61, in __len__
length = self._client__.evaluate(RpcObjectProxy(self._uri__, self._client__, path, self))
File "C:\Users\admin\AppData\Local\Programs\Python\Python39\lib\site-packages\hrpc\client.py", line 84, in evaluate
raise RpcRemoteException(resp)
hrpc.exceptions.RpcRemoteException: java.lang.ClassCastException: com.netease.open.libpoco.Node cannot be cast to java.util.Map

|-- Remote Traceback --|

java.lang.ClassCastException: com.netease.open.libpoco.Node cannot be cast to java.util.Map
at com.netease.open.hrpc.backend.RpcServer.onRequest(RpcServer.java:198)
at com.netease.open.hrpc.backend.RpcServer.serve(RpcServer.java:57)
at fi.iki.elonen.NanoHTTPD$HTTPSession.execute(NanoHTTPD.java:840)
at fi.iki.elonen.NanoHTTPD$ClientHandler.run(NanoHTTPD.java:189)
at java.lang.Thread.run(Thread.java:761)

|-- Remote Traceback end --|
[17:28:54][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe -s DB5322AR40256 forward --remove tcp:17809
[17:28:54][DEBUG] C:\Users\admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\airtest\core\android\static\adb\windows\adb.exe -s DB5322AR40256 forward --remove tcp:13877
[Finished]

**python 版本:** `python3.9`

**poco 版本:** `1.0.85`
> poco版本通过`pip freeze`可以命令可以查到

**设备:**
- 型号: [e.g. google pixel 2]
- 系统: [e.g. Android 7]
- (别的信息)