If you get below error message :
info: [debug] Error: Could not find a device to launch. You requested 'iPhone 6 (0249BE06-CD62-4873-ABBD-10849C84C13D) (8.1 Simulator)', but the available devices were: ["iPhone 6 (8.1 Simulator) [0249BE06-CD62-4873-ABBD-10849C84C13D]"]
Solution :
Appium GUI from in list "'iPhone 6 (0249BE06-CD62-4873-ABBD-10849C84C13D) (8.1 Simulator)" remove all text except "iPhone 6" and try again.
