Was ist die VJS?

System.Web.HttpCompileException (0x80004005): C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\2b7771b1\a43ecee1\App_Web_registerreiter.cshtml.e552008c.zuao3txn.0.cs(36): error CS0433: The type 'Registerreiter' exists in both 'App_Web_all.generated.cs.8f9494c4.kgqd5iw0, Version=0.0.0.1, Culture=neutral, PublicKeyToken=null' and 'umbJaegerverband, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'
   bei System.Web.Compilation.AssemblyBuilder.Compile()
   bei System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
   bei System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
   bei System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
   bei System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
   bei System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound)
   bei System.Web.Compilation.BuildManager.GetCompiledType(VirtualPath virtualPath)
   bei System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer)
   bei Umbraco.Web.Mvc.ProfilingView.Render(ViewContext viewContext, TextWriter writer) in D:\a\1\s\src\Umbraco.Web\Mvc\ProfilingView.cs:Zeile 25.
   bei System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   bei Our.Umbraco.DocTypeGridEditor.Web.Extensions.HtmlHelperExtensions.RenderDocTypeGridEditorItem(HtmlHelper helper, IPublishedElement content, String editorAlias, String viewPath, String previewViewPath, Boolean isPreview)
   bei ASP._Page_app_plugins_doctypegrideditor_render_DocTypeGridEditor_cshtml.Execute() in D:\inetpub\wwwroot\umbJaegerverband\app_plugins\doctypegrideditor\render\DocTypeGridEditor.cshtml:Zeile 28.
   bei System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   bei System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   bei System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   bei Umbraco.Web.Mvc.ProfilingView.Render(ViewContext viewContext, TextWriter writer) in D:\a\1\s\src\Umbraco.Web\Mvc\ProfilingView.cs:Zeile 25.
   bei System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   bei ASP._Page_Views_Partials_grid_editors_Base_cshtml.Execute() in D:\inetpub\wwwroot\umbJaegerverband\Views\Partials\grid\editors\Base.cshtml:Zeile 20.