Debug: [INST STDERR] Instruments Trace Error : ***

Hi I am facing one issues in below versions.

Appium 1.2.0
xcode 5.1.1
iOS 7.1.1

I am getting following error

debug: [INST STDERR] Instruments Trace Error : *** -[NSURL URLByAppendingPathComponent(inlove): component, components, or pathExtension cannot be nil.

debug: [INSTSERVER] Instruments exited with code 0

debug: Cleaning up after instruments exit
debug: Instruments exited unexpectedly

error: uncaughtException: Maximum call stack size exceeded date=Fri Jan 23 2015 11:59:38’

It is a random error some times its executed perfectly or some times I get above error.
Any help will greatly appreciated.