Почему в рабочем проекте вдруг возникла ошибка XamlParseException

Message="Вызов конструктора для типа "Wpf_3_PressADay.MainWindow", удовлетворяющего указанным ограничениям привязки, привел к выдаче исключения.": номер строки "3" и позиция в строке "9".
Source=PresentationFramework
LineNumber=3
LinePosition=9
StackTrace:
в System.Windows.Markup.XamlReader.RewrapE xception(Exception e, IXamlLineInfo lineInfo, Uri baseUri)
в System.Windows.Markup.WpfXamlLoader.Load (XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
в System.Windows.Markup.WpfXamlLoader.Load Baml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
в System.Windows.Markup.XamlReader.LoadBam l(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
в System.Windows.Application.LoadBamlStrea mWithSyncInfo(Stream stream, ParserContext pc)
в System.Windows.Application.LoadComponent (Uri resourceLocator, Boolean bSkipJournaledProperties)
в System.Windows.Application.DoStartup()
в System.Windows.Application.<.ctor>b__1(O bject unused)
в System.Windows.Threading.ExceptionWrappe r.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
в MS.Internal.Threading.ExceptionFilterHel per.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
в System.Windows.Threading.DispatcherOpera tion.InvokeImpl()
в System.Windows.Threading.DispatcherOpera tion.InvokeInSecurityContext(Object state)
в System.Threading.ExecutionContext.runTry Code(Object userData)
в System.Runtime.CompilerServices.RuntimeH elpers.ExecuteCodeWithGuaranteedCleanup( TryCode code, CleanupCode backoutCode, Object userData)
в System.Threading.ExecutionContext.RunInt ernal(ExecutionContext executionContext, ContextCallback callback, Object state)
в System.Threading.ExecutionContext.Run(Ex ecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
в System.Threading.ExecutionContext.Run(Ex ecutionContext executionContext, ContextCallback callback, Object state)
в System.Windows.Threading.DispatcherOpera tion.Invoke()
в System.Windows.Threading.Dispatcher.Proc essQueue()
в System.Windows.Threading.Dispatcher.WndP rocHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
в MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
в MS.Win32.HwndSubclass.DispatcherCallback Operation(Object o)
в System.Windows.Threading.ExceptionWrappe r.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
в MS.Internal.Threading.ExceptionFilterHel per.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
в System.Windows.Threading.Dispatcher.Invo keImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
в MS.Win32.HwndSubclass.SubclassWndProc(In tPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
в MS.Win32.UnsafeNativeMethods.DispatchMes sage(MSG& msg)
в System.Windows.Threading.Dispatcher.Push FrameImpl(DispatcherFrame frame)
в System.Windows.Threading.Dispatcher.Push Frame(DispatcherFrame frame)
в System.Windows.Threading.Dispatcher.Run( )
в System.Windows.Application.RunDispatcher (Object ignore)
в System.Windows.Application.RunInternal(W indow window)
в System.Windows.Application.Run(Window window)
в System.Windows.Application.Run()
в Wpf_3_PressADay.App.Main() в C:\Users\Владимир\Desktop\Wpf_3_PressADa y\Wpf_3_PressADay\obj\x86\Debug\App.g.cs :строка 0
в System.AppDomain._nExecuteAssembly(Runti meAssembly assembly, String[] args)
в System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
в Microsoft.VisualStudio.HostingProcess.Ho stProc.RunUsersAssembly()
в System.Threading.ThreadHelper.ThreadStar t_Context(Object state)
в System.Threading.ExecutionContext.Run(Ex ecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
в System.Threading.ExecutionContext.Run(Ex ecutionContext executionContext, ContextCallback callback, Object state)
в System.Threading.ThreadHelper.ThreadStar t()
InnerException: System.IO.IOException
Message=Не удается найти ресурс "c".
Source=PresentationFramework
StackTrace:
в MS.Internal.AppModel.ResourcePart.GetStr eamCore(FileMode mode, FileAccess access)
в System.IO.Packaging.PackagePart.GetStrea m(FileMode mode, FileAccess access)
в System.IO.Packaging.PackagePart.GetStrea m()
в System.Windows.Application.LoadComponent (Object component, Uri resourceLocator)
в Wpf_3_PressADay.MainWindow.InitializeCom ponent() в c:\Users\Владимир\Desktop\Wpf_3_PressADa y\Wpf_3_PressADay\MainWindow.xaml:строка 1
в Wpf_3_PressADay.MainWindow..ctor() в C:\Users\Владимир\Desktop\Wpf_3_PressADa y\Wpf_3_PressADay\MainWindow.xaml.cs:стр ока 36
InnerException: