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An unknown server-side error occurred while processing the command

When you encounter the error java.util.concurrent.ExecutionException: org.openqa.selenium.WebDriverException: An unknown server-side error occurred while processing the command.

Original error: Could not proxy command to the remote server.

Original error: timeout of 240000ms exceeded.

  1. Install Webdriveragent.
  2. Kill the running appium proccesses with the following command: killall -9 node.
  3. Start the AUT again.