Could not find a connected Android device. (Selenium::WebDriver::Error::UnknownError)

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I am unable to run my android automation test and I get the following error message:

An unknown server-side error occurred while processing the command. 
Original error: Could not find a connected Android device. 
(Selenium::WebDriver::Error::UnknownError)

I also get this message on the Appium server logs:

[ADB] Could not find devices, restarting adb server...
[ADB] Restarting adb

I have tried adb devices and I get an empty list. How can I add a few dummie android devices or will the developer do this?

Can somebody please be kind enough to give me some advice?

1 Answers
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