selenium.common.exceptions.WebDriverException: Message: An unknown server-side error occurred while processing the command. Original error: Cannot start the 'com.agui.mall' application. Visit https://github.com/appium/appium/blob/master/docs/en/writing-running-appium/android/activity-startup.md for troubleshooting. Original error: Error executing adbExec. Original error: 'Command 'D:\android_sdk\android-sdk-windows\platform-tools\adb.exe -P 5037 -s 127.0.0.1:21503 shell am start -W -n com.XXX.XXX/com.XXX.XXX.activity.WelcomeActivity -S' timed out after 20000ms'; Stderr: ''; Code: 'null'