Running DNN 7.1.2 and noticed we are unable to delete a website.  Currently the only visible error message is

Error: is currently unavailable. DotNetNuke.Services.Exceptions.ModuleLoadException: The file or directory is corrupted and unreadable. ---> System.IO.IOException: The file or directory is corrupted and unreadable. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileSystemEnumerableIterator`1.MoveNext() at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.IO.Directory.InternalGetFileDirectoryNames(String path, String userPathOriginal, String searchPattern, Boolean includeFiles, Boolean includeDirs, SearchOption searchOption, Boolean checkHost) at System.IO.Directory.InternalGetDirectories(String path, String searchPattern, SearchOption searchOption) at DotNetNuke.Common.Globals.DeleteFilesRecursive(String strRoot, String filter) at DotNetNuke.Common.Globals.DeleteFilesRecursive(String strRoot, String filter) at DotNetNuke.Common.Globals.DeleteFilesRecursive(String strRoot, String filter) at DotNetNuke.Entities.Portals.PortalController.DeletePortal(PortalInfo portal, String serverPath) at DesktopModules.Admin.Portals.SiteSettings.DeletePortal(Object sender, EventArgs e) --- End of inner exception stack trace ---

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any suggestion how to debug this error is greatly appreciated