点击报错
An unknown server-side error occurred while processing the command.original error:pkg:/data/local/tmp/appium_cache
解决办法：
增加配置如下：
automationName=UiAutomator1
再次运行 start session，正常
注：用 automationName=UiAutomator2 运行仍然报错
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Pycharm中的警告如下：
DEPRECATION WARNING: [Appium] [Appium] The 'automationName' capability was not provided in the desired [Appium] capabilities for this Android session [Appium] [Appium] Setting 'automationName=UiAutomator2' by default and using the [Appium] UiAutomator2 Driver [Appium] [Appium] The next major version of Appium (2.x) will **require** the [Appium] 'automationName' capability to be set for all sessions on all [Appium] platforms [Appium] [Appium] In previous versions (Appium <= 1.13.x), the default was [Appium] 'automationName=UiAutomator1' [Appium] [Appium] If you wish to use that automation instead of UiAutomator2, please [Appium] add 'automationName=UiAutomator1' to your desired capabilities [Appium] [Appium] For more information about drivers, please visit [Appium] http://appium.io/docs/en/about-appium/intro/ and explore the [Appium] 'Drivers' menu
根据提示在配置中增加
automationName=UiAutomator2
如下：
再次运行，虽然警告没有了，但是用例还是运行失败
修改为如下后，运行成功
automationName=UiAutomator1
运行结果如下：
