连接手机，获取UI树报错如下gateway error, time used 0.1s

[WinError adb shell am instrument -w -r -e debug false -e class com.github.uiautomator.stub.Stub com.github.uiautomator.test/android.support.test.runner.AndroidJUnitRunner] uiautomator2.GatewayError(gateway error, time used 0.1s): 'https://github.com/openatx/uiautomator2/wiki/Common-issues'

报错如上，就是获取一个界面的UI树。