Resource Busy Error in Xamarin

I am trying to run the demo here for using WCF in Xamarin here

The Android app compiles but I get the error below when trying to run the iphone app

I have restarted my MAC and reattached the phone and keep getting this

I was trying to use this in Visual Studio (using Parallels) initially, then I changed over to try it Xamarin studio

codesign -v -f -s "572B56F74A74705027876BB948164ED500CC3E37" "--resource-rules=/Volumes/C/temp/XamarinWCF/iOS/bin/iPhone/Debug/http://iOS.app/ResourceRules.plist" --entitlements "/Volumes/C/temp/XamarinWCF/iOS/bin/iPhone/Debug/iOS.xcent" "/Volumes/C/temp/XamarinWCF/iOS/bin/iPhone/Debug/iOS.app" Warning: --resource-rules has been deprecated in Mac OS X >= 10.10! /Volumes/C/temp/XamarinWCF/iOS/bin/iPhone/Debug/iOS.app: Resource busy

Does anyone have any idea?

Paul