Received an error from the server
An error occured
Object reference not set to an instance of an object.

Exception Details
System.NullReferenceException: Object reference not set to an instance of an object.
Stacktrace
at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.RefreshMediaTypesLocked(List`1 removedIds, List`1 refreshedIds, List`1 otherIds, List`1 newIds) in d:\a\1\s\src\Umbraco.Web\PublishedCache\NuCache\PublishedSnapshotService.cs:line 1060
   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.Notify[T](ContentStore store, JsonPayload[] payloads, Action`4 action) in d:\a\1\s\src\Umbraco.Web\PublishedCache\NuCache\PublishedSnapshotService.cs:line 867
   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.Notify(JsonPayload[] payloads) in d:\a\1\s\src\Umbraco.Web\PublishedCache\NuCache\PublishedSnapshotService.cs:line 818
   at Umbraco.Web.Cache.ContentTypeCacheRefresher.<>c__DisplayClass12_0.<Refresh>b__6() in d:\a\1\s\src\Umbraco.Web\Cache\ContentTypeCacheRefresher.cs:line 94
   at Umbraco.Core.PublishedModelFactoryExtensions.WithSafeLiveFactory(IPublishedModelFactory factory, Action action) in d:\a\1\s\src\Umbraco.Core\PublishedModelFactoryExtensions.cs:line 37
   at Umbraco.Web.Cache.ContentTypeCacheRefresher.Refresh(JsonPayload[] payloads) in d:\a\1\s\src\Umbraco.Web\Cache\ContentTypeCacheRefresher.cs:line 93
   at Umbraco.Core.Sync.ServerMessengerBase.DeliverLocal[TPayload](ICacheRefresher refresher, TPayload[] payload) in d:\a\1\s\src\Umbraco.Core\Sync\ServerMessengerBase.cs:line 165
   at Umbraco.Core.Sync.ServerMessengerBase.Deliver[TPayload](ICacheRefresher refresher, TPayload[] payload) in d:\a\1\s\src\Umbraco.Core\Sync\ServerMessengerBase.cs:line 295
   at Umbraco.Core.Sync.ServerMessengerBase.PerformRefresh[TPayload](ICacheRefresher refresher, TPayload[] payload) in d:\a\1\s\src\Umbraco.Core\Sync\ServerMessengerBase.cs:line 64
   at Umbraco.Web.Cache.DistributedCache.RefreshByPayload[TPayload](Guid refresherGuid, IEnumerable`1 payloads) in d:\a\1\s\src\Umbraco.Web\Cache\DistributedCache.cs:line 94
   at Umbraco.Web.Cache.DistributedCacheExtensions.RefreshContentTypeCache(DistributedCache dc, ContentTypeChange`1[] changes) in d:\a\1\s\src\Umbraco.Web\Cache\DistributedCacheExtensions.cs:line 225
   at Umbraco.Web.Cache.DistributedCacheBinder.MediaTypeService_Changed(IMediaTypeService sender, EventArgs args) in d:\a\1\s\src\Umbraco.Web\Cache\DistributedCacheBinder_Handlers.cs:line 302
   at Umbraco.Core.Events.EventDefinition`2.RaiseEvent() in d:\a\1\s\src\Umbraco.Core\Events\EventDefinition.cs:line 69
   at Umbraco.Core.Events.QueuingEventDispatcher.ScopeExitCompleted() in d:\a\1\s\src\Umbraco.Core\Events\QueuingEventDispatcher.cs:line 23
   at Umbraco.Core.Events.QueuingEventDispatcherBase.ScopeExit(Boolean completed) in d:\a\1\s\src\Umbraco.Core\Events\QueuingEventDispatcherBase.cs:line 337
   at Umbraco.Core.Scoping.Scope.<>c__DisplayClass72_0.<RobustExit>b__1() in d:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:line 436
   at Umbraco.Core.Scoping.Scope.TryFinally(Int32 index, Action[] actions) in d:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:line 474
   at Umbraco.Core.Scoping.Scope.TryFinally(Int32 index, Action[] actions) in d:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:line 478
   at Umbraco.Core.Scoping.Scope.RobustExit(Boolean completed, Boolean onException) in d:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:line 422
   at Umbraco.Core.Scoping.Scope.DisposeLastScope() in d:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:line 402
   at Umbraco.Core.Scoping.Scope.Dispose() in d:\a\1\s\src\Umbraco.Core\Scoping\Scope.cs:line 365
   at Umbraco.Core.Services.Implement.ContentTypeServiceBase`3.Save(TItem item, Int32 userId) in d:\a\1\s\src\Umbraco.Core\Services\Implement\ContentTypeServiceBaseOfTRepositoryTItemTService.cs:line 414
   at Umbraco.Web.Editors.MediaTypeController.<PostSave>b__12_1(IMediaType type) in d:\a\1\s\src\Umbraco.Web\Editors\MediaTypeController.cs:line 195
   at Umbraco.Web.Editors.ContentTypeControllerBase`1.PerformPostSave[TContentTypeDisplay,TContentTypeSave,TPropertyType](TContentTypeSave contentTypeSave, Func`2 getContentType, Action`1 saveContentType, Action`1 beforeCreateNew) in d:\a\1\s\src\Umbraco.Web\Editors\ContentTypeControllerBase.cs:line 293
   at Umbraco.Web.Editors.MediaTypeController.PostSave(MediaTypeSave contentTypeSave) in d:\a\1\s\src\Umbraco.Web\Editors\MediaTypeController.cs:line 192
   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.ActionExecutor.Execute(Object instance, Object[] arguments)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__15.MoveNext()