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System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
   at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
   at System.Collections.Generic.List`1.get_Item(Int32 index)
   at ASP._Page_Views_Partials_TypedGrid_DocTypeGridEditors_GridBookingWizard_cshtml.Execute() in C:\Octopus\Applications\Production\UpplandsMotor.Web.UI\1.0.2361\Views\Partials\TypedGrid\DocTypeGridEditors\GridBookingWizard.cshtml:line 31
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at Umbraco.Web.Mvc.ProfilingView.Render(ViewContext viewContext, TextWriter writer) in D:\a\1\s\src\Umbraco.Web\Mvc\ProfilingView.cs:line 25
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at Our.Umbraco.DocTypeGridEditor.Web.Extensions.HtmlHelperExtensions.RenderDocTypeGridEditorItem(HtmlHelper helper, IPublishedElement content, String editorAlias, String viewPath, String previewViewPath, Boolean isPreview) in C:\Development\PlayGround\Open Source\DocTypeGridEditor\src\Our.Umbraco.DocTypeGridEditor\Web\Extensions\HtmlHelperExtensions.cs:line 105
   at ASP._Page_app_plugins_doctypegrideditor_render_DocTypeGridEditor_cshtml.Execute() in C:\Octopus\Applications\Production\UpplandsMotor.Web.UI\1.0.2361\app_plugins\doctypegrideditor\render\DocTypeGridEditor.cshtml:line 41
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at Umbraco.Web.Mvc.ProfilingView.Render(ViewContext viewContext, TextWriter writer) in D:\a\1\s\src\Umbraco.Web\Mvc\ProfilingView.cs:line 25
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at ASP._Page_Views_Partials_typedgrid_editors_Base_cshtml.Execute() in C:\Octopus\Applications\Production\UpplandsMotor.Web.UI\1.0.2361\Views\Partials\typedgrid\editors\Base.cshtml:line 20