Instrument crashed on start-up and Exception encountered connecting to coresimulatorbridge

I have an issue while launching the application through Appium on iOS simulator’s on Mac.

Configuration that I have on my Mac:

  • MacOS : OS X Yosemite10.10.4

  • Appium: 1.4.0 (Draco)

  • iOS simulators I tried on: iOS 8.4, 7.1 and 8.1

  • XCode: 6.4 (6E35b)

I have installed as per the instructions given under Appium.io and able to launch the Appium server successfully.

When tried to lunch the application by using the capabilities to install and to access the application I am getting a popup notification as “Exception encountered connecting to coresimulatorbridge”. And sometimes I am getting a message as “Instrument crashed on start-up” within the Appium log info.

Please help me if anyone have solution for this