Invalid Tempate error on nested grids inside editorTemplate popup of ASP.NET Core Kendo Grid - asp.net-core-mvc

Question

I have a ASP.NET Core Kendo grid which display's list of Users. The grid has pouup mode editor template. The Kendo Grid code looks like this.
#(Html.Kendo().Grid<Anju.PubSTRAT.Web.Areas.Admin.Models.UserViewModel>()
.Name("UserGrid")
.Columns(columns =>
{
columns.Command(command =>
{
if (UserAccessService.CanEdit("User"))
{
command.Edit().UpdateText("Submit").Text(" ");
command.Custom("Clear").Text(" ").IconClass("k-icon k-i-clear-css k-grid-features").HtmlAttributes(new { title = "Clear User", #class = "k-grid-custom" }).Click("User_clearUser");
command.Custom("Email").Text(" ").IconClass("k-icon k-i-envelop").HtmlAttributes(new { title = "Send Welcome Email", #class = "k-grid-custom" }).Click("User_sendWelcomeEmail");
command.Custom("Unlock").Text(" ").IconClass("k-icon k-i-unlock").Visible("function (e) { return (!e.IsLockedOut); }").HtmlAttributes(new { title = "Disable User", #class = "k-grid-custom" }).Click("User_disableUser");
command.Custom("Lock").Text(" ").IconClass("k-icon k-i-lock").Visible("function (e) { return (e.IsLockedOut); }").HtmlAttributes(new { title = "Enable User", #class = "k-grid-custom" }).Click("User_enableUser");
command.Custom("UserFile").Text(" ").IconClass("k-icon k-i-file").HtmlAttributes(new { title = "User Profile File", #class = "k-grid-custom" }).Click("User_openFilePopup");
}
}).Width(75);
columns.Bound(p => p.UserId).Hidden(true);
columns.Bound(p => p.UserName).MinResizableWidth(100);
columns.Bound(p => p.Prefix).MinResizableWidth(50);
columns.Bound(p => p.FirstName).MinResizableWidth(50);
columns.Bound(p => p.LastName).MinResizableWidth(50);
columns.Bound(p => p.Suffix).MinResizableWidth(50);
columns.Bound(p => p.Email).MinResizableWidth(100);
columns.Bound(p => p.PhoneNumber).MinResizableWidth(60);
})
.ToolBar(toolbar =>
{
toolbar.Custom().Text("Reset Filters").HtmlAttributes(new { id = "resetAllGridFilters", #class = "btn-grid-toolbar", onclick = "ResetGridFilter(\"UserGrid\")" });
if (UserAccessService.CanAdd("User"))
{
toolbar.Create().Text("Add New User").HtmlAttributes(new { #class = "btn-grid-toolbar" });
}
if (UserAccessService.IsAnjuAdmin)
{
toolbar.Custom().Text("Flag Reset Security").HtmlAttributes(new { id = "flagResetSecurity",#class = "btn-grid-toolbar", onclick = "User_flagResetSecurity()" });
toolbar.Custom().Text("Unflag Reset Security").HtmlAttributes(new { id = "unFlagResetSecurity",#class = "btn-grid-toolbar", onclick = "User_unFlagResetSecurity()" });
}
toolbar.Custom().Text("Show Disabled Users").HtmlAttributes(new { id = "showHideDisabledUsers", #class = "btn-grid-toolbar", onclick = "showHideDisabledUsers()" });
})
.Pageable(pageable => pageable
.Refresh(true)
.Responsive(false)
.PageSizes(Constants.PageSizes)
.ButtonCount(5))
.Sortable()
.Scrollable()
.Resizable(resize => resize.Columns(true))
.Filterable()
.Events(e => e.DataBound("gridDataBoundAutoFit"))
.Events(e => e.Edit("User_AddEditUser"))
.DataSource(dataSource => dataSource
.Ajax()
.PageSize(UserAccessService.PageSize)
.ServerOperation(true)
.Events(e => e.RequestEnd("User_AddProductDetails"))
.Events(events => events.Error("onGridError"))
.Model(model => model.Id(p => p.UserId))
.Read(read => read.Action("GetUserList", "User").Data("getUserDetailsOptions"))
.Create(create => create.Action("AddUser", "User"))
.Update(update => update.Action("UpdateUser", "User")))
.Editable(editable => editable.Mode(GridEditMode.PopUp).TemplateName("User").Window(w => w.Height(670).Width(600)))
)
The Editor template is having tab strips and one of tab is having nested Kendo grid.
The Code for the ASP.NET Core Kendo Grid is as follows :
<script id="UserProductSegmentTemplate" type="text/kendo">
#(Html.Kendo().Grid<Anju.PubSTRAT.Web.Areas.Admin.Models.SegmentViewModel>()
.Name("UserProductSegmentGrid#=ProductId#")
.Columns(columns =>
{
columns.Select().Width(50);
columns.Bound(c => c.SegmentId).Width(0).Hidden();
columns.Bound(c => c.Name).Title("Segment Name").Width(100);
})
.Sortable()
.Scrollable()
.PersistSelection()
.NoRecords(records => records.Template("No Records."))
.DataSource(dc => dc.Ajax()
.ServerOperation(true)
.Model(model => model.Id(p => p.SegmentId))
.Read(read => read.Action("GetSegmentList", "Segment", new { productId = 1 }))
)
.ToClientTemplate()
)
</script>
<div class="row">
#(Html.Kendo().Grid<Anju.PubSTRAT.Web.Areas.Admin.Models.ProductViewModel>()
.Name("ProductGrid")
.Columns(columns =>
{
columns.Select().Width(50);
columns.Bound(p => p.ProductId).Hidden(true);
columns.Bound(p => p.Name).MinResizableWidth(200);
columns.Bound(p => p.Identifier).MinResizableWidth(150);
columns.Bound(p => p.GenericName).MinResizableWidth(150);
})
.Pageable(pageable => pageable
.Refresh(true)
.Responsive(true)
.PageSizes(Constants.PageSizes)
.ButtonCount(5))
.Sortable()
.Scrollable()
.Resizable(resize => resize.Columns(true))
.Filterable()
.PersistSelection()
.Events(e => e.Change("onUserProductGridChange"))
.Events(e => e.DataBound("onUserProductDataBound"))
.ClientDetailTemplateId("UserProductSegmentTemplate")
.DataSource(dataSource => dataSource
.Ajax()
.PageSize(UserAccessService.PageSize)
.ServerOperation(true)
.Model(model => model.Id(p => p.ProductId))
.Read(read => read.Action("GetProductList", "Product")))
.ToClientTemplate()
)
</div>
When I click on "Add New User" toolbar button the editor popup opens but grid is not getting rendered and getting "Invalid template" in browser console.