This is a migrated thread and some comments may be shown as answers.

Error Creating Control - ... Unknown server tag

3 Answers 537 Views

General Discussions

This is a migrated thread and some comments may be shown as answers.

Darren asked on 30 Jul 2008, 09:33 PM

We are using RadControls for ASP.NET 2.X, Q3 2007

A developer is getting this message when opeing any aspx in VS with RadControls:
Error Creating Control - RadMenu1 Unknown server tag

This is occurring for all pages with RadControls. I am not getting this error message. What could be causing this?

Thanks for your help.

Here is one aspx page giving the error (although all other pages do as well):

@ Master Language="C#" AutoEventWireup="true" CodeBehind="Navigation1.Master.cs" Inherits="EAI_Dashboard.Navigation1" %>

@ Register Assembly="RadMenu.Net2" Namespace="Telerik.WebControls" TagPrefix="rad" %>

@ Register Assembly="RadTabStrip.Net2" Namespace="Telerik.WebControls" TagPrefix="rad" %>

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

html xmlns="http://www.w3.org/1999/xhtml" >

<head>

</head>

<rad:RadMenu ID="RadMenu1" runat="server" OnItemClick="RadMenu1_ItemClick" Width="100%">

<Items>

<rad:RadMenuItem runat="server" NavigateUrl="~/Default.aspx" Text="Home">

</rad:RadMenuItem>

<rad:RadMenuItem runat="server" NavigateUrl="~/EventDashboard.aspx" Text="Dashboard">

</rad:RadMenuItem>

<rad:RadMenuItem runat="server" NavigateUrl="~/MapData.aspx" Text="Data Mapping">

</rad:RadMenuItem>

<rad:RadMenuItem runat="server" NavigateUrl="~/ReportControl.aspx" Text="Report Control">

</rad:RadMenuItem>

<rad:RadMenuItem runat="server" NavigateUrl="~/Admin.aspx" Text="Administration">

<Items>

<rad:RadMenuItem runat="server" NavigateUrl="~/AdminUserSecurity.aspx" Text="User Security">

</rad:RadMenuItem>

<rad:RadMenuItem runat="server" NavigateUrl="~/AdminMapData.aspx" Text="Data Map Definition">

</rad:RadMenuItem>

<rad:RadMenuItem runat="server" NavigateUrl="~/AdminGroupSubgroup.aspx" Text="Group/SubGroup">

</rad:RadMenuItem>

<rad:RadMenuItem runat="server" NavigateUrl="~/AdminStatus.aspx" Text="Status Setup">

</rad:RadMenuItem>

</Items>

</rad:RadMenuItem>

<rad:RadMenuItem runat="server" Text="Tools" Visible="False">

<Items>

<rad:RadMenuItem runat="server" Text="Export to Excel" >

</rad:RadMenuItem>

<rad:RadMenuItem runat="server" Text="Filter On/Off">

</rad:RadMenuItem>

</Items>

</rad:RadMenuItem>

</Items>

</rad:RadMenu>

<tr>

<asp:contentplaceholder runat="server" id="_mainContent2" />

</td>

</tr>

</table>

</form>

</body>

html>

3 Answers, 1 is accepted

answered on 31 Jul 2008, 12:14 AM

Darren-

Sorry to hear you're having trouble. Let's see if we can solve this. Can you tell me if the page still runs in the browser? Sometimes VS' assembly cache gets out of whack and it gives errors that aren't "real." If the page still functions correctly (despite the VS errors), the fix is probably a simple matter of clearing your ASP.NET Temporary Files and making sure the Telerik.Web.UI assembly is properly referenced in your web app.

If you get an error when you run the page, there may be a problem with your referenced assembly or your web.config. Make sure the correct Telerik.Web.UI.dll is in your developer's Bin directory and make any references to the Telerik.Web.UI assembly in the web.config are configured for the correct version.

Let's start there and see what happens.

-Todd