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Visual Studio encountered an exception

So, I use Visual Studio 2010, and last week I get a message from Visual Studio: "Visual Studio encountered an exception. It could be caused by the extension."

My ActivityLog.xml shows logs as a problem:

<entry>
    <record>321</record>
    <time>2012/09/20 16:52:36.126</time>
    <type>Error</type>
    <source>Editor or Editor Extension</source>
    <description>System.ComponentModel.Composition.CompositionException: The composition produced a single composition error. The root cause is provided below. 
Review the CompositionException.Errors property for more detailed information.&#x000D;&#x000A;&#x000D;&#x000A;1) Object reference not set to an instance of an object.&#x000D;&#x000A;&#x000D;&#x000A;Resulting in: An exception occurred while calling the &apos;OnImportsSatisfied&apos; method on type &apos;Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSKeyword&apos;.&#x000D;&#x000A;&#x000D;&#x000A;Resulting in: Cannot activate part &apos;Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSKeyword&apos;.&#x000D;&#x000A;Element: Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSKeyword --&gt;  Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSKeyword&#x000D;&#x000A;&#x000D;&#x000A;Resulting in: Cannot get export &apos;Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSKeyword (ContractName=&quot;Microsoft.VisualStudio.Text.Classification.EditorFormatDefinition&quot;)&apos; from part &apos;Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSKeyword&apos;.&#x000D;&#x000A;Element: Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSKeyword (ContractName=&quot;Microsoft.VisualStudio.Text.Classification.EditorFormatDefinition&quot;) --&gt;  Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSKeyword&#x000D;&#x000A;&#x000D;&#x000A;   at System.ComponentModel.Composition.Hosting.CompositionServices.GetExportedValueFromComposedPart(ImportEngine engine, ComposablePart part, ExportDefinition definition)&#x000D;&#x000A;   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportedValue(ComposablePart part, ExportDefinition export, Boolean isSharedPart)&#x000D;&#x000A;   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.CatalogExport.GetExportedValueCore()&#x000D;&#x000A;   at System.ComponentModel.Composition.Primitives.Export.get_Value()&#x000D;&#x000A;   at System.ComponentModel.Composition.ExportServices.GetExportedValueFromLazy[T](Export export)&#x000D;&#x000A;   at System.ComponentModel.Composition.ExportServices.&lt;&gt;c__DisplayClass4`2.&lt;CreateStronglyTypedExportOfTM&gt;b__1()&#x000D;&#x000A;   at System.Lazy`1.CreateValue()&#x000D;&#x000A;   at System.Lazy`1.LazyInitValue()&#x000D;&#x000A;   at System.Lazy`1.get_Value()&#x000D;&#x000A;   at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.InstantiateExtension[TExtension](Object errorSource, Lazy`1 provider)</description>
</entry>

<entry>
    <record>322</record>
    <time>2012/09/20 16:52:36.202</time>
    <type>Error</type>
    <source>Editor or Editor Extension</source>
    <description>System.ComponentModel.Composition.CompositionException: The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.&#x000D;&#x000A;&#x000D;&#x000A;1) Object reference not set to an instance of an object.&#x000D;&#x000A;&#x000D;&#x000A;Resulting in: An exception occurred while calling the &apos;OnImportsSatisfied&apos; method on type &apos;Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSComment&apos;.&#x000D;&#x000A;&#x000D;&#x000A;Resulting in: Cannot activate part &apos;Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSComment&apos;.&#x000D;&#x000A;Element: Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSComment --&gt;  Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSComment&#x000D;&#x000A;&#x000D;&#x000A;Resulting in: Cannot get export &apos;Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSComment (ContractName=&quot;Microsoft.VisualStudio.Text.Classification.EditorFormatDefinition&quot;)&apos; from part &apos;Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSComment&apos;.&#x000D;&#x000A;Element: Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSComment (ContractName=&quot;Microsoft.VisualStudio.Text.Classification.EditorFormatDefinition&quot;) --&gt;  Microsoft.VisualStudio.Web.Exports.ExportedClassificationFormatCSSComment&#x000D;&#x000A;&#x000D;&#x000A;   at System.ComponentModel.Composition.Hosting.CompositionServices.GetExportedValueFromComposedPart(ImportEngine engine, ComposablePart part, ExportDefinition definition)&#x000D;&#x000A;   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportedValue(ComposablePart part, ExportDefinition export, Boolean isSharedPart)&#x000D;&#x000A;   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.CatalogExport.GetExportedValueCore()&#x000D;&#x000A;   at System.ComponentModel.Composition.Primitives.Export.get_Value()&#x000D;&#x000A;   at System.ComponentModel.Composition.ExportServices.GetExportedValueFromLazy[T](Export export)&#x000D;&#x000A;   at System.ComponentModel.Composition.ExportServices.&lt;&gt;c__DisplayClass4`2.&lt;CreateStronglyTypedExportOfTM&gt;b__1()&#x000D;&#x000A;   at System.Lazy`1.CreateValue()&#x000D;&#x000A;   at System.Lazy`1.LazyInitValue()&#x000D;&#x000A;   at System.Lazy`1.get_Value()&#x000D;&#x000A;   at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.InstantiateExtension[TExtension](Object errorSource, Lazy`1 provider)</description>
</entry>

It seems that there is no specific action that causes this, sometimes it happens when I first start VS, sometimes after I leave my table for a while and return. In addition, this happens from the journal immediately after loading the Visual Studio CSS editing package. I have MVC4 installed, maybe this is a problem with the new CSS (think CSS3)?

In any case, it’s just interesting, someone came across this before and had some kind of permission.

+5
5

VS . VS "RUN AS ADMINISTRATOR". . .

+4

- > → Reset .

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, ActivityLog.xml :

System.ComponentModel.Composition.CompositionException: . . CompositionException.Errors more detailed information. 1) No , : ContractName Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.IWebLinterAggregator RequiredTypeIdentity Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.IWebLinterAggregator Resulting in: & APOS; Microsoft.Web.Editor.Composition.ComponentLocator(Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.IWebLinterAggregator) + SingleImporter.Import(ContractName = "Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.IWebLinterAggregator" ) & APOS; 'Microsoft.Web.Editor.Composition.ComponentLocator(Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.IWebLinterAggregator)+SingleImporter'. Element: Microsoft.Web.Editor.Composition.ComponentLocator(Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.IWebLinterAggregator) + SingleImporter.Import(ContractName = "Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.IWebLinterAggregator" ) -- > Microsoft.Web.Editor.Composition.ComponentLocator(Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.IWebLinterAggregator)+SingleImporter System.ComponentModel.Composition.CompositionResult.ThrowOnErrors(AtomicComposition atomicComposition) at System.ComponentModel.Composition.Hosting.ImportEngine.SatisfyImportsOnce(ComposablePart part) at System.ComponentModel.Composition.Hosting.CompositionContainer.SatisfyImportsOnce(ComposablePart part) at Microsoft.VisualStudio.Composition.NetFxAdapters.CompositionService.SatisfyImportsOnce(ComposablePart part) at System.ComponentModel.Composition.AttributedModelServices.SatisfyImportsOnce(ICompositionService compositionService, Object attributedPart) at Microsoft.Web.Editor.Composition.ComponentLocator`1.Import() Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.LinterUtilities.< > c.<.cctor > b__4_1() at System.Lazy`1.CreateValue() at System.Lazy`1.LazyInitValue() at System.Lazy`1.get_Value() at Microsoft.VisualStudio.Web.Editor.Package.Lint.WebLinter.LinterUtilities.IsFileSupported(String fileName) at Microsoft.VisualStudio.Web.Editor.Package.Lint.ErrorTagger.LintErrorTaggerProvider.CreateTagger [] (ITextBuffer textBuffer) at Microsoft.VisualStudio.Text.Tagging.Implementation.TagAggregator`1.GatherTaggers(ITextBuffer TextBuffer)

I solved it by going to Tools → Extensions and Updates → Updates → Visual Studio Gallery → Installed a new version Microsoft ASP.NET and Web Tools

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Download the required web pages for your version of VS. He sorted my problem in ActivityLog.xml.  Web resource

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