自从今年7月份以来，微信升级后， appium就无法获取小程序页面元素了。

appium的error log：

[MJSONWP (5ddd1a8c)]     at JWProxy.proxy (C:\Program Files\Appium\resources\app\node_modules\appium\node_modules\appium-base-driver\lib\jsonwp-proxy\proxy.js:213:13)
[W3C] Matched W3C error code 'unknown error' to UnknownError
[HTTP] <-- GET /wd/hub/session/5ddd1a8c-b45d-4505-906e-4932fe5020e6/source 500 15567 ms - 244
[HTTP] 
[WD Proxy] Got response with status 200: {"sessionId":"dd1cd7a1-4ed4-4c63-86c4-dbd6b2f9e60b","value":"iVBORw0KGgoAAAANSUhEUgAABDgAAAkkCAYAAAD508+vAAAAAXNSR0IArs4c6QAAAARzQklUCAgI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\nUkp89rOfg8lkGtHx...
[WD Proxy] Matched '/wd/hub/session/5ddd1a8c-b45d-4505-906e-4932fe5020e6/window/current/size' to command name 'getWindowSize'
[WD Proxy] Proxying [GET /wd/hub/session/5ddd1a8c-b45d-4505-906e-4932fe5020e6/window/current/size] to [GET http://localhost:8200/wd/hub/session/dd1cd7a1-4ed4-4c63-86c4-dbd6b2f9e60b/window/current/size] with body: {}
[MJSONWP (5ddd1a8c)] Responding to client with driver.getScreenshot() result: "iVBORw0KGgoAAAANSUhEUgAABDgAAAkkCAYAAAD508+vAAAAAXNSR0IArs4c6QAAAARzQklUCAgI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\nu3Y1fF...
[HTTP] <-- GET /wd/hub/session/5ddd1a8c-b45d-4505-906e-4932fe5020e6/screenshot 200 16205 ms - 828480
[HTTP] 
[WD Proxy] Got response with status 200: {"sessionId":"dd1cd7a1-4ed4-4c63-86c4-dbd6b2f9e60b","value":{"height":2139,"width":1080}}
[WD Proxy] Replacing sessionId dd1cd7a1-4ed4-4c63-86c4-dbd6b2f9e60b with 5ddd1a8c-b45d-4505-906e-4932fe5020e6
[HTTP] <-- GET /wd/hub/session/5ddd1a8c-b45d-4505-906e-4932fe5020e6/window/current/size 200 16327 ms - 100

获取页面元素超时：GET /wd/hub/session/5ddd1a8c-b45d-4505-906e-4932fe5020e6/source 500

selenium.common.exceptions.WebDriverException: Message: An unknown server-side error occurred while processing the command. Original error: Timed out after 10000 milliseconds waiting for root AccessibilityNodeInfo

如果把微信降级到老版本的话这个问题就不发生了。 但是微信会自动升级，所以测试开发的时候总是要先降级才能用。 很恼人的一个问题。

希望微信端能把这个问题解了。