Right-click on your project and then select "Edit" (project name).csproj. (e.g. Edit in notepad)
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Find this
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
Then, add the following, in the above line.
<PropertyGroup>
<VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">13.0</VisualStudioVersion>
<VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
</PropertyGroup>
That's it, save and reload your project.
Hope it helps!