This is the log output:
System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Configuration.ConfigurationErrorsException: Type 'Website.CompositeApps.MediaViewer.MediaViewerActionProvider, Website.CompositeApps.MediaViewer' could not be resolved (C:\_danso\_Development\_Composite\Väla\WebsiteComposite\Website\App_Data\Composite\Composite.config line 276)
at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult)
at System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject)
at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
at Composite.Core.Configuration.FileConfigurationSourceImplementation.GetSection(String sectionName)
at Composite.Core.Configuration.FileConfigurationSource.GetSection(String sectionName)
at Composite.C1Console.Elements.Foundation.ElementActionProviderRegistryImpl.Resources.Initialize(Resources resources)
at Composite.Core.Collections.Generic.ResourceLocker`1.Initialize()
at Composite.C1Console.Elements.Foundation.ElementActionProviderRegistryImpl.get_ElementActionProviderNames()
at Composite.C1Console.Elements.Foundation.ElementActionProviderFacade.AddActions(IEnumerable`1 elements, String providerName)
at Composite.C1Console.Elements.ElementFacade.GetRoots(String providerName, SearchToken searchToken, Boolean performSecurityCheck, Boolean useForeign)
at Composite.Plugins.Elements.ElementProviders.VirtualElementProvider.VirtualElementProvider.GetChildren(EntityToken entityToken, SearchToken seachToken, Boolean useForeign)
at Composite.C1Console.Elements.Foundation.PluginFacades.ElementProviderPluginFacade.GetChildren(String providerName, EntityToken entityToken, SearchToken seachToken)
at Composite.C1Console.Elements.ElementFacade.GetChildren(ElementHandle elementHandle, SearchToken searchToken, Boolean performSecurityCheck, Boolean useForeign)
at Composite.Core.WebClient.FlowMediators.TreeServicesFacade.GetChildren(String providerName, String serializedEntityToken, String piggybag, String serializedSearchToken)
at Composite.Services.TreeServices.GetElementsBySearchToken(ClientElement clientElement, String serializedSearchToken) in c:\_danso\_Development\_Composite\Väla\WebsiteComposite\Website\Composite\services\Tree\TreeServices.asmx:line 146
at Composite.Services.TreeServices.GetElements(ClientElement clientElement) in c:\_danso\_Development\_Composite\Väla\WebsiteComposite\Website\Composite\services\Tree\TreeServices.asmx:line 86
--- End of inner exception stack trace ---