I did get this in my custom shader patch today:
System.Windows.Markup.XamlParseException: The invocation of the constructor on type 'AcManager.Pages.Settings.SettingsShadersPatch' that matches the specified binding constraints threw an exception. ---> System.IO.FileNotFoundException: Could not find file 'C:\Users\egonm\OneDrive\Documenten\Assetto Corsa\cfg\extension'.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.Directory.InternalCreateDirectory(String fullPath, String path, Object dirSecurityObj, Boolean checkHost)
at System.IO.Directory.InternalCreateDirectoryHelper(String path, Boolean checkHost)
at System.IO.Directory.CreateDirectory(String path)
at AcManager.Pages.Settings.SettingsShadersPatch.ViewModel.CreateConfigs()
at AcManager.Pages.Settings.SettingsShadersPatch.ViewModel..ctor(Boolean isLive)
at AcManager.Pages.Settings.SettingsShadersPatch..ctor()
--- End of inner exception stack trace ---
at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
at System.Windows.Application.LoadBamlStreamWithSyncInfo(Stream stream, ParserContext pc)
at System.Windows.Application.LoadComponent(Uri resourceLocator, Boolean bSkipJournaledProperties)
at System.Windows.Application.LoadComponent(Uri resourceLocator)
at FirstFloor.ModernUI.Windows.DefaultContentLoader.<LoadContentAsync>d__0.MoveNext()