Hi,
There is an error while loading the Microsoft.VisualStudio.Package.LanguageService.10.0.dll in Visual studio 2013 due to mismatch in the bindingRedirect @version in devenv.exe.config file.
<dependentAssembly>
<assemblyIdentity name="Microsoft.VisualStudio.Package.LanguageService.11.0" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
<bindingRedirect oldVersion="2.0.0.0-11.0.0.0" newVersion="12.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.VisualStudio.Package.LanguageService.10.0" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
<bindingRedirect oldVersion="2.0.0.0-11.0.0.0" newVersion="12.0.0.0" />
</dependentAssembly>
This is a known issue, people have posted longback(https://connect.microsoft.com/VisualStudio/feedback/details/794961/previous-version-assemblies-cannot-load-in-visual-studio-2013-preview) and someone also posted saying it is resolved in RC update. Even after installing the latest updates for VS2013 the issue still persists.
I have also tried overriding the binding redirect in app.config and machine.config as well, even that didnt help.
Is this actually resolved in any of the other updates or it is not resolved yet? Please let us know the solution for this issue.