Error in Parsing View "~/views/synwayforms/shopprodukteouterform.cshtml": System.Web.HttpCompileException (0x80004005): C:\SERVERDATEN\synway4x64_NOW\shop-oberhausen-owt\views\synwayeditfields\editfieldproduct2shoppingcart_Basel.cshtml(11): error CS0012: The type 'HttpClient' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. 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 System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) bei ASP._Page_Views_SynwayForms_ShopProdukte2InnerForm_OWT_cshtml.Execute() in C:\SERVERDATEN\synway4x64_NOW\shop-oberhausen-owt\Views\SynwayForms\ShopProdukte2InnerForm_OWT.cshtml:Zeile 237. 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 System.Web.Mvc.Html.RenderPartialExtensions.RenderPartial(HtmlHelper htmlHelper, String partialViewName, Object model) bei ASP._Page_views_synwayforms_shopprodukteinnerform_OWT_cshtml.Execute() in C:\SERVERDATEN\synway4x64_NOW\shop-oberhausen-owt\views\synwayforms\shopprodukteinnerform_OWT.cshtml:Zeile 6. 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 System.Web.Mvc.Html.RenderPartialExtensions.RenderPartial(HtmlHelper htmlHelper, String partialViewName, Object model) bei ASP._Page_Views_SynwayFormTemplates_OuterForm_Basel_cshtml.Execute() in C:\SERVERDATEN\synway4x64_NOW\shop-oberhausen-owt\Views\SynwayFormTemplates\OuterForm_Basel.cshtml:Zeile 65. 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 System.Web.Mvc.Html.RenderPartialExtensions.RenderPartial(HtmlHelper htmlHelper, String partialViewName, Object model) bei ASP._Page_views_synwayforms_shopprodukteouterform_cshtml.Execute() in C:\SERVERDATEN\synway4x64_NOW\shop-oberhausen-owt\views\synwayforms\shopprodukteouterform.cshtml:Zeile 4. 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 SynwayMVC.ControllerExtension.RenderPartialViewToString(Controller controller, String viewName, Object model) in D:\a\1\s\SynwayMVC\Utils\ControllerExtension.cs:Zeile 47.