Application Output

Xamarin.iOS: USING STAGING SERVER FOR ACTIVATION
Please ensure your device is connected...
Connected to: iPhone
warning MT1003: Could not kill the application 'com.tesco.sampleapp'. You may have to kill the application manually.
warning MT1108: Could not find developer tools for this 8.0 (12A4345d) device. Please ensure you are using a compatible Xcode version and then connect this device to Xcode to install the development support files.
error MT1007: Failed to launch the application 'com.tesco.sampleapp' on the device 'iPhone': Look for earlier warnings returned: 0x454. You can still launch the application manually by tapping on it.
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/8F751C5B-5DCF-4824-9744-6E68D9D930C3/iOSCoreTest.app/monotouch.dll [External]
Thread started: Finalizer #2
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/8F751C5B-5DCF-4824-9744-6E68D9D930C3/iOSCoreTest.app/System.dll [External]
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/8F751C5B-5DCF-4824-9744-6E68D9D930C3/iOSCoreTest.app/System.Core.dll [External]
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/8F751C5B-5DCF-4824-9744-6E68D9D930C3/iOSCoreTest.app/System.Net.Http.Primitives.dll [External]
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/8F751C5B-5DCF-4824-9744-6E68D9D930C3/iOSCoreTest.app/System.Net.Http.dll [External]
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/8F751C5B-5DCF-4824-9744-6E68D9D930C3/iOSCoreTest.app/ModernHttpClient.dll [External]
Loaded assembly: /private/var/mobile/Containers/Bundle/Application/8F751C5B-5DCF-4824-9744-6E68D9D930C3/iOSCoreTest.app/iOSCoreTest.exe
2014-08-07 18:59:54.980 iOSCoreTest[398:57187] SendAsync start...
Thread started: <Thread Pool> #3
Thread started: <Thread Pool> #4
2014-08-07 18:59:55.259 iOSCoreTest[398:57187] Exception Details: 
Message: Cannot cast from source type to destination type.
Stacktrace:   at (wrapper castclass) object:__castclass_with_cache (object,intptr,intptr)
  at MonoTouch.ObjCRuntime.Runtime.ConstructNSObject[NSUrlSessionDataTask] (IntPtr ptr, System.Type type, MissingCtorResolution missingCtorResolution) [0x00000] in <filename unknown>:0 
  at MonoTouch.ObjCRuntime.Runtime.GetNSObject[NSUrlSessionDataTask] (IntPtr ptr) [0x00000] in <filename unknown>:0 
  at MonoTouch.Foundation.NSUrlSession.CreateDataTask (MonoTouch.Foundation.NSUrlRequest request) [0x00014] in /Developer/MonoTouch/Source/monotouch/src/build/compat/Foundation/NSUrlSession.g.cs:138 
  at ModernHttpClient.NativeMessageHandler+<SendAsync>c__async0.MoveNext () [0x00000] in <filename unknown>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000b] in /Developer/MonoTouch/Source/mono/mcs/class/corlib/System.Runtime.ExceptionServices/ExceptionDispatchInfo.cs:62 
  at System.Runtime.CompilerServices.TaskAwaiter`1[System.Net.Http.HttpResponseMessage].GetResult () [0x00000] in <filename unknown>:0 
  at CoreTest.CoreTestViewController+<ExecuteQuery>c__async0.MoveNext () [0x000d3] in /Users/MM/Downloads/APIFails 2/iOSCoreTest-Individual/CoreTest/CoreTestViewController.cs:46