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I turned my computer on today and the following message is displayed on Visual studio 2012. And appears on all my programs, and I am unable to reload the designer on any program. I'm not quite sure what to do as I can't find a solution.

Microsoft.Internal.Assumes+InternalErrorException

Internal error occurred. Additional information: ''.

at System.ComponentModel.Composition.Hosting.ImportEngine.InPrerequisiteLoop() at System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImportsStateMachine(PartManager partManager, ComposablePart part) at System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImports(PartManager partManager, ComposablePart part, Boolean shouldTrackImports) at System.ComponentModel.Composition.Hosting.ImportEngine.SatisfyImports(ComposablePart part) at System.ComponentModel.Composition.Hosting.CompositionServices.GetExportedValueFromComposedPart(ImportEngine engine, ComposablePart part, ExportDefinition definition) at System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportedValue(CatalogPart part, ExportDefinition export, Boolean isSharedPart) at System.ComponentModel.Composition.Hosting.CatalogExportProvider.CatalogExport.GetExportedValueCore() at System.ComponentModel.Composition.Primitives.Export.get_Value() at System.ComponentModel.Composition.ExportServices.GetCastedExportedValue[T](Export export) at System.ComponentModel.Composition.Hosting.ExportProvider.GetExportedValuesCore[T](String contractName) at Microsoft.Expression.DesignHost.Isolation.Remoting.Marshaler.EnsureMarshalers() at Microsoft.Expression.DesignHost.Isolation.Remoting.Marshaler.Marshal[TFrom](TFrom value) at Microsoft.Expression.DesignHost.Isolation.IsolatedExportProvider.ComposeExportedValue[T](T value) at Microsoft.Expression.DesignHost.IsolatedDesignerService.CreateLease(IIsolationTarget isolationTarget, CancellationToken cancelToken, DesignerServiceEntry& entry) at Microsoft.Expression.DesignHost.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo(CancellationToken cancelToken) at Microsoft.Expression.DesignHost.Isolation.IsolatedTaskScheduler.InvokeWithCulture[T](CultureInfo culture, Func2 func, CancellationToken cancelToken) at Microsoft.Expression.DesignHost.Isolation.IsolatedTaskScheduler.<>c__DisplayClassa1.b__6() at System.Threading.Tasks.Task`1.InnerInvoke() at System.Threading.Tasks.Task.Execute()

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up vote 1 down vote accepted

Try re installing the VS update 1.

I found this thread while doing a Google Search :MSDN Thread

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