ArgumentException: The path is not of a legal form.

[chucklu]

Choose dependency and click cancel button will trigger this exception
2021-04-23 10:41:12.087 +08:00 [ERR] System.ArgumentException: The path is not of a legal form.
at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
at System.IO.Path.InternalGetDirectoryName(String path)
at System.IO.Path.GetDirectoryName(String path)
at DependentChecker.MainWindow.FindDependent(String dependencyPath) in C:\Users\clu\source\repos\DependentChecker\DependentChecker\MainWindow.xaml.cs:line 91
at DependentChecker.MainWindow.DependencyChoose_Click(Object sender, RoutedEventArgs e) in C:\Users\clu\source\repos\DependentChecker\DependentChecker\MainWindow.xaml.cs:line 37
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
at System.Windows.Controls.Primitives.ButtonBase.OnClick()
at System.Windows.Controls.Button.OnClick()