Visual Studio 2012 loading error -


i have error when load visual studio 2012: "an exception has been encountered. may caused extension."

and here message xml file:

system.componentmodel.composition.compositionexception: composition produced single composition error, 2 root causes.  root causes provided below.  review compositionexception.errors property more detailed information. ) export microsoft.visualstudio.shell.svsserviceprovider not assignable type system.boolean.  resulting in: cannot set import &apos;microsoft.visualstudio.javascript.web.extensions.shared.iregistrymanager.isknockoutenabled (contractname=&quot;microsoft.visualstudio.shell.svsserviceprovider&quot;)&apos; on part &apos;microsoft.visualstudio.javascript.web.extensions.shared.registrymanager&apos;. element: microsoft.visualstudio.javascript.web.extensions.shared.iregistrymanager.isknockoutenabled (contractname=&quot;microsoft.visualstudio.shell.svsserviceprovider&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.shared.registrymanager  resulting in: cannot export &apos;microsoft.visualstudio.javascript.web.extensions.shared.registrymanager (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.iregistrymanager&quot;)&apos; part &apos;microsoft.visualstudio.javascript.web.extensions.shared.registrymanager&apos;. element: microsoft.visualstudio.javascript.web.extensions.shared.registrymanager (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.iregistrymanager&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.shared.registrymanager  resulting in: cannot set import &apos;microsoft.visualstudio.javascript.web.extensions.shared.ibufferfeaturemanagerprovider.tebufferfeaturemanager (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.iregistrymanager&quot;)&apos; on part &apos;microsoft.visualstudio.javascript.web.extensions.shared.bufferfeaturemanagerprovider&apos;. element: microsoft.visualstudio.javascript.web.extensions.shared.ibufferfeaturemanagerprovider.tebufferfeaturemanager (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.iregistrymanager&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.shared.bufferfeaturemanagerprovider  resulting in: cannot export &apos;microsoft.visualstudio.javascript.web.extensions.shared.bufferfeaturemanagerprovider (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.ibufferfeaturemanagerprovider&quot;)&apos; part &apos;microsoft.visualstudio.javascript.web.extensions.shared.bufferfeaturemanagerprovider&apos;. element: microsoft.visualstudio.javascript.web.extensions.shared.bufferfeaturemanagerprovider (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.ibufferfeaturemanagerprovider&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.shared.bufferfeaturemanagerprovider  resulting in: cannot set import &apos;microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider.bufferfeaturemanagerprovider (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.ibufferfeaturemanagerprovider&quot;)&apos; on part &apos;microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider&apos;. element: microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider.bufferfeaturemanagerprovider (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.ibufferfeaturemanagerprovider&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider  resulting in: cannot export &apos;microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider (contractname=&quot;microsoft.visualstudio.text.tagging.iviewtaggerprovider&quot;)&apos; part &apos;microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider&apos;. element: microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider (contractname=&quot;microsoft.visualstudio.text.tagging.iviewtaggerprovider&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider  2) export &apos;microsoft.visualstudio.web.extensions.html.tagnameprovider (contractname=&quot;microsoft.visualstudio.web.extensions.html.itagnameprovider&quot;)&apos; not assignable type &apos;system.collections.generic.iset`1[[system.string, mscorlib, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089]]&apos;.  resulting in: cannot set import &apos;microsoft.visualstudio.javascript.web.extensions.shared.ispasupportedtagprovider.supportedtagnames (contractname=&quot;microsoft.visualstudio.web.extensions.html.itagnameprovider&quot;)&apos; on part &apos;microsoft.visualstudio.javascript.web.extensions.shared.spasupportedtagset&apos;. element: microsoft.visualstudio.javascript.web.extensions.shared.ispasupportedtagprovider.supportedtagnames (contractname=&quot;microsoft.visualstudio.web.extensions.html.itagnameprovider&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.shared.spasupportedtagset  resulting in: cannot export &apos;microsoft.visualstudio.javascript.web.extensions.shared.spasupportedtagset (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.ispasupportedtagprovider&quot;)&apos; part &apos;microsoft.visualstudio.javascript.web.extensions.shared.spasupportedtagset&apos;. element: microsoft.visualstudio.javascript.web.extensions.shared.spasupportedtagset (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.ispasupportedtagprovider&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.shared.spasupportedtagset  resulting in: cannot set import &apos;microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider.tagnameprovider (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.ispasupportedtagprovider&quot;)&apos; on part &apos;microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider&apos;. element: microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider.tagnameprovider (contractname=&quot;microsoft.visualstudio.javascript.web.extensions.shared.ispasupportedtagprovider&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider  resulting in: cannot export &apos;microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider (contractname=&quot;microsoft.visualstudio.text.tagging.iviewtaggerprovider&quot;)&apos; part &apos;microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider&apos;. element: microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider (contractname=&quot;microsoft.visualstudio.text.tagging.iviewtaggerprovider&quot;) --&gt;  microsoft.visualstudio.javascript.web.extensions.classification.sparegiontaggerprovider     @ system.componentmodel.composition.hosting.compositionservices.getexportedvaluefromcomposedpart(importengine engine, composablepart part, exportdefinition definition)    @ system.componentmodel.composition.hosting.catalogexportprovider.getexportedvalue(catalogpart part, exportdefinition export, boolean issharedpart)    @ system.componentmodel.composition.hosting.catalogexportprovider.catalogexport.getexportedvaluecore()    @ system.componentmodel.composition.primitives.export.get_value()    @ system.componentmodel.composition.exportservices.getcastedexportedvalue[t](export export)    @ system.componentmodel.composition.exportservices.&lt;&gt;c__displayclass4`2.&lt;createstronglytypedlazyoftm&gt;b__1()    @ system.lazy`1.createvalue()    @ system.lazy`1.lazyinitvalue()    @ system.lazy`1.get_value()    @ microsoft.visualstudio.text.tagging.implementation.tagaggregator`1.gathertaggers(itextbuffer textbuffer)</description> 

does know can fix it?

regards,

benjamin

cool, worked me, update assemblies tag in web.config file. during load of project ide not able load assemblies. here below...

          <add assembly="system.web.extensions, version=4.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"/>   <add assembly="system.servicemodel.activation, version=4.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"/>   <add assembly="system.runtime.serialization, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.web.applicationservices, version=4.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"/>   <add assembly="system, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.web, version=4.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a"/>   <add assembly="system.configuration, version=4.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a"/>   <add assembly="system.servicemodel, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.xml, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.web.services, version=4.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a"/>   <add assembly="system.data, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.core, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.data.linq, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.drawing, version=4.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a"/>   <add assembly="system.windows.forms, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.servicemodel.web, version=4.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"/>   <add assembly="system.data.services.client, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.data.services.design, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.data.entity, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.design, version=4.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a"/>   <add assembly="system.web.dynamicdata, version=4.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"/>   <add assembly="system.componentmodel.dataannotations, version=4.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"/>   <add assembly="system.web.entity, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/>   <add assembly="system.xml.linq, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"/> 

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