Internal Server Error

This is a statuscode page (InternalServerError).
        System.Web.HttpCompileException (0x80004005): C:\home\site\wwwroot\Views\World\Pages\LongArticlePage.cshtml(3): error CS0234: The type or namespace name 'ScriptBlock' does not exist in the namespace 'Mammoet.Web.Models.World.Blocks' (are you missing 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)