Internal Server Error

This is a statuscode page (InternalServerError).
        System.Web.HttpCompileException (0x80004005): C:\home\site\wwwroot\Views\Shared\Pages\NewsDetailPage.cshtml(52): error CS1061: 'NewsDetailViewModel' does not contain a definition for 'SimilarCasesAside' and no accessible extension method 'SimilarCasesAside' accepting a first argument of type 'NewsDetailViewModel' could be found (are you missing a using directive or an assembly reference?)
   at System.Web.Compilation.BuildManager.PostProcessFoundBuildResult(BuildResult result, Boolean keyFromVPP, VirtualPath virtualPath)
   at System.Web.Compilation.BuildManager.GetBuildResultFromCacheInternal(String cacheKey, Boolean keyFromVPP, VirtualPath virtualPath, Int64 hashCode, Boolean ensureIsUpToDate)
   at System.Web.Compilation.WebDirectoryBatchCompiler.AddBuildProviders(Boolean retryIfDeletionHappens)