An error occurs and the program is forced to close

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I get an error like this:

System.ArgumentException: パスに無効な文字が含まれています。 場所 System.IO.Path.CheckInvalidPathChars(String path, Boolean checkAdditional) 場所 System.IO.Path.GetFileName(String path) 場所 Vividl.ViewModel.VideoViewModel.videoDownloadStateChanged(Object _, ProgressEventArgs e) 場所 Vividl.Model.MediaEntry.RaiseDownloadStateChanged(DownloadProgress p) 場所 Vividl.Model.MediaEntry.<.ctor>b__31_0(DownloadProgress p) 場所 System.Progress`1.InvokeHandlers(Object state) 場所 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) 場所 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) 場所 System.Windows.Threading.DispatcherOperation.InvokeImpl() 場所 System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) 場所 MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj) 場所 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) 場所 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) 場所 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 場所 MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state) 場所 System.Windows.Threading.DispatcherOperation.Invoke() 場所 System.Windows.Threading.Dispatcher.ProcessQueue() 場所 System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 場所 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 場所 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) 場所 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) 場所 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) 場所 System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) 場所 MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) 場所 MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) 場所 System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) 場所 System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) 場所 System.Windows.Application.RunDispatcher(Object ignore) 場所 System.Windows.Application.RunInternal(Window window) 場所 System.Windows.Application.Run(Window window) 場所 Vividl.App.Main()