HI I am not able to save changes to the main page:

See the image and error log

System.Exception: Failed to get node at /. at Umbraco.Web.PublishedCache.NuCache.ContentCache.ApplyHideTopLevelNodeFromPath(IPublishedContent content, IList1 segments, Boolean preview) in D:\a\1\s\src\Umbraco.Web\PublishedCache\NuCache\ContentCache.cs:line 210 at Umbraco.Web.PublishedCache.NuCache.ContentCache.GetRouteByIdInternal(Boolean preview, Int32 contentId, Nullable1 hideTopLevelNode, String culture) in D:\a\1\s\src\Umbraco.Web\PublishedCache\NuCache\ContentCache.cs:line 172 at Umbraco.Web.PublishedCache.NuCache.ContentCache.<>cDisplayClass130.0() in D:\a\1\s\src\Umbraco.Web\PublishedCache\NuCache\ContentCache.cs:line 132 at Umbraco.Core.Cache.AppCacheExtensions.<>cDisplayClass501.<GetCacheItem>b__0() in D:\a\1\s\src\Umbraco.Core\Cache\AppCacheExtensions.cs:line 62 at Umbraco.Core.Cache.FastDictionaryAppCacheBase.<>c__DisplayClass21_0.<GetSafeLazy>b__0() in D:\a\1\s\src\Umbraco.Core\Cache\FastDictionaryAppCacheBase.cs:line 285 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at Umbraco.Core.Cache.FastDictionaryAppCache.Get(String cacheKey, Func1 getCacheItem) in D:\a\1\s\src\Umbraco.Core\Cache\FastDictionaryAppCache.cs:line 34 at Umbraco.Core.Cache.AppCacheExtensions.GetCacheItem[T](IAppCache provider, String cacheKey, Func1 getCacheItem) in D:\a\1\s\src\Umbraco.Core\Cache\AppCacheExtensions.cs:line 62 at Umbraco.Web.Routing.RedirectTrackingComponent.StoreOldRoute(IContent entity, OldRoutesDictionary oldRoutes) in D:\a\1\s\src\Umbraco.Web\Routing\RedirectTrackingComponent.cs:line 118 at Umbraco.Web.Routing.RedirectTrackingComponent.ContentService_Publishing(IContentService sender, PublishEventArgs1 args) in D:\a\1\s\src\Umbraco.Web\Routing\RedirectTrackingComponent.cs:line 65 at Umbraco.Core.Events.QueuingEventDispatcherBase.DispatchCancelable[TSender,TArgs](TypedEventHandler2 eventHandler, TSender sender, TArgs args, String eventName) in D:\a\1\s\src\Umbraco.Core\Events\QueuingEventDispatcherBase.cs:line 54 at Umbraco.Core.Services.Implement.ContentService.StrategyCanPublish(IScope scope, IContent content, Boolean checkPath, IReadOnlyList1 culturesPublishing, IReadOnlyCollection1 culturesUnpublishing, EventMessages evtMsgs, ContentSavingEventArgs savingEventArgs, IReadOnlyCollection1 allLangs) in D:\a\1\s\src\Umbraco.Core\Services\Implement\ContentService.cs:line 2673 at Umbraco.Core.Services.Implement.ContentService.CommitDocumentChangesInternal(IScope scope, IContent content, ContentSavingEventArgs saveEventArgs, IReadOnlyCollection1 allLangs, Int32 userId, Boolean raiseEvents, Boolean branchOne, Boolean branchRoot) in D:\a\1\s\src\Umbraco.Core\Services\Implement\ContentService.cs:line 1174 at Umbraco.Core.Services.Implement.ContentService.SaveAndPublish(IContent content, String[] cultures, Int32 userId, Boolean raiseEvents) in D:\a\1\s\src\Umbraco.Core\Services\Implement\ContentService.cs:line 976 at Umbraco.Web.Editors.ContentController.PublishInternal(ContentItemSave contentItem, String defaultCulture, String cultureForInvariantErrors, Boolean& wasCancelled, String[]& successfulCultures) in D:\a\1\s\src\Umbraco.Web\Editors\ContentController.cs:line 1410 at Umbraco.Web.Editors.ContentController.PostSaveInternal(ContentItemSave contentItem, Func2 saveMethod, Func2 mapToDisplay) in D:\a\1\s\src\Umbraco.Web\Editors\ContentController.cs:line 867 at lambda_method(Closure , Object , Object[] ) at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass6_2.<GetExecutor>b__2(Object instance, Object[] methodParameters) at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary2 arguments, CancellationToken cancellationToken) --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Controllers.ApiControllerActionInvoker.1.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Filters.ActionFilterAttribute.