Unable to start application on this device: : An unknown server-side error occurred while processing the command. Original error: Could not install app: 'Command 'ios-deploy --id

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Hi @brian.lai,

The first thing to check would be your version of Appium. For best compatibility, it’s recommended you using Appium Server 1.8.2-beta.

You can find some more common troubleshooting tips here:

If you continue to have issues, please let me know.

Chris