Unable to lauch the iOS simulator - appium throws 'Error: We exceeded the number of retries allowed for instruments to successfully start; failing launch'

Hi all,

I am trying to run the automation script in Mac machine, please find the following specs
Mac OS: OS X 10.11.2
iOS: 9.3
iPhone6
appium version: 1.5.2
Xcode: 7.3
I got the following error message, If any of you have faced similar issue kindly let know. Simulator is not booting.
“-An unknown server-side error occurred while processing the command. Original error: We exceeded the number of retries allowed for instruments to successfully start; failing launch (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 180.79 seconds”
What could be the possible issue here, If anyone is aware of it kindly let me know.
Thanks.

late but meet same. enabling dev mode helped me:

$ DevToolsSecurity -status
Developer mode is currently disabled.

$ DevToolsSecurity -enable
Developer mode is now enabled.