I have implemented MvcDonutCaching for caching of the pages of a website, and RedisOutputCacheProvider as the provider for the caching. This all works well for the frontend.

However, I am having problems in the backend. Whenever I try to publish content for a document type that is marked for caching, I am receiving the following exception:

Ensure that your custom OutputCacheProvider implements IEnumerable<KeyValuePair<string, object>>.

Stacktrace:

[NotSupportedException: Ensure that your custom OutputCacheProvider implements IEnumerable<KeyValuePair<string, object>>.]
   DevTrends.MvcDonutCaching.OutputCacheManager.RemoveItems(String controllerName, String actionName, RouteValueDictionary routeValues) in C:\Users\moonpyk\Documents\Visual Studio 2013\Projects\MvcDonutCaching\DevTrends.MvcDonutCaching\OutputCacheManager.cs:144
   DevTrends.MvcDonutCaching.OutputCacheManager.RemoveItems() in C:\Users\moonpyk\Documents\Visual Studio 2013\Projects\MvcDonutCaching\DevTrends.MvcDonutCaching\OutputCacheManager.cs:99
   Supershift.Umbraco.Web.RegisterEvents.ClearDonutOutputCache() in (...)\RegisterEvents.cs:57
   Supershift.Umbraco.Web.RegisterEvents.CachePageEvents_CacheUpdated(PageCacheRefresher sender, CacheRefresherEventArgs e) in (...)\RegisterEvents.cs:51
   Umbraco.Core.Events.TypedEventHandler`2.Invoke(TSender sender, TEventArgs e) +0
   Umbraco.Core.Cache.CacheRefresherBase`1.OnCacheUpdated(TInstanceType sender, CacheRefresherEventArgs args) +49
   Umbraco.Core.Cache.CacheRefresherBase`1.RefreshAll() +74
   Umbraco.Web.Cache.PageCacheRefresher.RefreshAll() +52
   Umbraco.Core.Sync.ServerMessengerBase.DeliverLocal(ICacheRefresher refresher, MessageType messageType, IEnumerable`1 ids, String json) +199
   Umbraco.Core.Sync.ServerMessengerBase.Deliver(IEnumerable`1 servers, ICacheRefresher refresher, MessageType messageType, IEnumerable`1 ids, String json) +80
   Umbraco.Core.Sync.ServerMessengerBase.PerformRefreshAll(IEnumerable`1 servers, ICacheRefresher refresher) +30
   Umbraco.Web.Cache.DistributedCache.RefreshAll(Guid factoryGuid) +216
   Umbraco.Web.Cache.DistributedCacheExtensions.RefreshAllPageCache(DistributedCache dc) +41
   umbraco.cms.presentation.republish.go(Object sender, EventArgs e) +819
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9815774
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +204
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639

Does anyone have a suggestion for how to solve this? Do I need to catch some event and clear the cache manually?