Building for iOS Simulator

I've just tried to get our app to run on the simulator and failed. I've then gone and tested a completely clean Unity project and got the same error. The iOS build is built from Unity with the Simulator SDK and I've tried a target iOS version of 5 and 7.1. I'm using Unity 4.5.5 The xcode project compiles and runs but crashes on boot in the following location

 #0 0x052aaa6a in __pthread_kill ()
 #1 0x05166b2f in pthread_kill ()
 #2 0x04f4a9c9 in abort ()
 #3 0x017a7cff in _interposition_vtable_unimplemented ()
 #4 0x017ba538 in open$UNIX2003 ()
 #5 0x00b5e387 in g_file_get_contents at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/eglib/src/gfile-posix.c:64
 #6 0x00aa48cc in mono_config_parse_file_with_context at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mono/metadata/mono-config.c:393
 #7 0x00aa4a20 in mono_config_parse_file at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mono/metadata/mono-config.c:427
 #8 0x00aa4e1b in mono_config_parse at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mono/metadata/mono-config.c:553
 #9 0x002879ce in InitializeMonoFromMain(std::vector<std::string, std::allocator<std::string> > const&, std::string, int, char const**, bool) at /Applications/buildAgent/work/d63dfc6385190b60/Runtime/Mono/MonoManager.cpp:2080
 #10 0x0002c59d in UnityInitApplicationNoGraphics at /Applications/buildAgent/work/d63dfc6385190b60/PlatformDependent/iPhonePlayer/LibEntryPoint.mm:164
 #11 0x0001d185 in -[UnityAppController application:didFinishLaunchingWithOptions:] at /Users/Henry/New Unity Project/test/Classes/UnityAppController.mm:185
 #12 0x01c1414f in -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] ()
 #13 0x01c14aa1 in -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] ()
 14 0x01c19667 in -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] ()
 #15 0x01c2df92 in -[UIApplication handleEvent:withNewEvent:] ()
 #16 0x01c2e555 in -[UIApplication sendEvent:] ()
 #17 0x01c1b250 in _UIApplicationHandleEvent ()
 #18 0x042aef02 in _PurpleEventCallback ()
 #19 0x042aea0d in PurpleEventCallback ()
 #20 0x04607ca5 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ ()
 #21 0x046079db in __CFRunLoopDoSource1 ()
 #22 0x0463268c in __CFRunLoopRun ()
 #23 0x046319d3 in CFRunLoopRunSpecific ()
 #24 0x046317eb in CFRunLoopRunInMode ()
 #25 0x01c18d9c in -[UIApplication _run] ()
 #26 0x01c1af9b in UIApplicationMain ()
 #27 0x00002925 in main at /Users/Henry/New Unity Project/test/Classes/main.mm:36

The console log contains only the following

 2014-12-09 12:19:34.410 ProductName[2933:90b] -> registered mono modules 0xd17500
 -> applicationDidFinishLaunching()
 Mono path[0] = '/Users/Henry/Library/Application Support/iPhone Simulator/7.1/Applications/EFB5F996-226D-472B-B68E-83F824CEC149/ProductName.app/Data/Managed'
 Mono config path = '/Users/Henry/Library/Application Support/iPhone Simulator/7.1/Applications/EFB5F996-226D-472B-B68E-83F824CEC149/ProductName.app/Data/Managed'
 Detected an attempt to call a symbol in system libraries that is not present on the iPhone:
 open$UNIX2003 called from function g_file_get_contents in image ProductName.

Does anybody know what is needed to get this working? Its necessary to send a simulator build to Facebook so they can review our app before we submit to Apple.