An unhandled exception Xamarin Forms Andorid

Hi,

Im trying to start my project but got error. I couldnot solve why am i get this error?

These are log last records

Xamarin.VisualStudio.Debugger.Controller Verbose: 0 : [2014-07-24 17:20:09.6] Entering Launch for: Xamarin.VisualStudio.Debugger.Controller
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:20:21.7] AD7DebugExceptionEvent ctor: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:20:21.7] AD7DebugExceptionEvent GetException: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:20:21.8] AD7DebugExceptionEvent GetException: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:20:21.8] AD7DebugExceptionEvent CanPassToDebuggee ()
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:20:21.8] AD7DebugExceptionEvent GetExceptionDescription: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:20:25.4] AD7DebugExceptionEvent GetException: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.MonoToolsDebuggerSession Verbose: 0 : [2014-07-24 17:21:33.4] Entering OnTargetExited for: Xamarin.VisualStudio.Android.MonoAndroidDebuggerSession
Xamarin.VisualStudio.Debugger.MonoToolsDebuggerSession Verbose: 0 : [2014-07-24 17:24:19.4] Entering constructor for: Xamarin.VisualStudio.Android.MonoAndroidDebuggerSession
Xamarin.VisualStudio.Debugger.MonoToolsDebuggerSession Verbose: 0 : [2014-07-24 17:24:19.4] Entering Start() for: Xamarin.VisualStudio.Android.MonoAndroidDebuggerSession
Xamarin.VisualStudio.Debugger.MonoToolsDebuggerSession Verbose: 0 : [2014-07-24 17:24:21.3] Entering OnTargetReady for: Xamarin.VisualStudio.Android.MonoAndroidDebuggerSession
Xamarin.VisualStudio.Debugger.Controller Verbose: 0 : [2014-07-24 17:24:21.4] Entering Launch for: Xamarin.VisualStudio.Debugger.Controller
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:24:33.5] AD7DebugExceptionEvent ctor: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:24:33.6] AD7DebugExceptionEvent GetException: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:24:33.6] AD7DebugExceptionEvent GetException: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:24:33.7] AD7DebugExceptionEvent CanPassToDebuggee ()
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:24:33.7] AD7DebugExceptionEvent GetExceptionDescription: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.AD7DebugExceptionEvent Verbose: 0 : [2014-07-24 17:24:41.5] AD7DebugExceptionEvent GetException: An unhandled exception occured.
Xamarin.VisualStudio.Debugger.MonoToolsDebuggerSession Verbose: 0 : [2014-07-24 17:24:49.0] Entering OnTargetExited for: Xamarin.VisualStudio.Android.MonoAndroidDebuggerSession