Image Manager not loading sub folders in UI for ASP.NET AJAX Editor

ric c

55 posts

Member since:
Mar 2005

Posted 08 Jun 2010 Link to this post

Hi,

I have a web application with a virtual directory set up within IIS for my images.

I place a rad editor on my aspx:

<telerik:RadEditor ID="RadEditor1" runat="server"></telerik:RadEditor>

Then in my codebehind:

                    string assetsRoot = "~/Assets112s/"; //this is the name of my virtual directory         
            RadEditor1.ImageManager.ViewPaths = new string[1] { assetsRoot + "Images" };         
                     

Within my Images folder (/assets112s/images) I have a series of folders and sub folders.

When I load my aspx and select the image manager, it loads fine and shows the correct file path in the image manager address bar(/Assets/Images) and it shows me the top level of the folders within Images (and any image files as well). However when I select one of the sub folders the loading image apprears by then does nothing... ie I cannot navigate down through my folders Please see attached image... any ideas?

I'm using version: 2010.1.309.20 problems on all browsers

imagemanagergrab.gif

ric c

55 posts

Member since:
Mar 2005

Posted 09 Jun 2010 Link to this post

Think I may have narrowed it down a little.

My project also has a custom URL rewriter that alters the root paths of various items (href links etc) switching this of allows the image manger to work ok.

I guess my problem is happening because of the AJAX postbacks that happen once a sub folder is selected. Any ideas on what I need to check ??

ric c

55 posts

Member since:
Mar 2005

Posted 10 Jun 2010 Link to this post

Still banging my head on this one.

When I open the dialogHandler.aspx :

http://localhost/MyApp/Telerik.Web.UI.DialogHandler.aspx?DialogName=ImageManager&Skin=Default&Title=Image%20Manager&doid=67bc3f99-e30d-4471-86df-12c627b546ed&dpptn=&dp=ZHViRm5gY1kQAnEAWHt7RRN%2BcgdiYjVGeXYwBSYsBVBQBWV3WhYMWm9xEF0YAHY3V2UBT3h9a10nDXlcdXd7RRN%2BcgdiZTZ8VwAKKyYGLw9rGmFBWnNzZ2xuEF4OA2ItVHp6WXh8cEYKdW1AW3RgdSZbAQVbAxRIZAB9NiAGFUxWBHFIWnIcRm9xFEgUDlQybGcBXVZvZEYXKHFDWgFjRQh1TwFqZndZbF88LxIGKwhQFXlEYRYqRWFxLkQjdFQwbEtMcm1vSU8fFkBKdXVkTyFhbQFsZgQFY2oGMCZzBVJgL19CYhcIRlBbF0IQK342VQBhRnlrRkwIAWYEdHd3ARZhCV5iAxR3b3UocyZyCX5TFUtdbXIQW29bLgUOA2ItVHp6WXh8cEYSAXljWwFkbghhUwFsdgREbwESKx5zFkpgL3VCW3MTRXh1OlAUPGp1YF5ue2RsRXMnKHFZW3RgcCdhclpidhBdb3cOKydzFW1WCl9CYhkIWW9hFAEOA2ItVHp6WXh8fEYTDX0BY2dCYx9hQFpbXC5DeVkWMx0WO09ocmFdYiwqQ1RuEEEgdAwwZHVYXVZ%2FCFsTDVtHY2YDXidhbUVqXARCVgARMAkCO25gc2lLby0ufVZxBAQMEFAkYAJYBGJUZ0chE31obF10XRdMVANsdjZiVnQoGyEJGVh%2FBwYDYSxzZVBhC0gnDkgIVwBMBWNuVV4nA2Voa11gbBMEakVhAzZiVnQoGyEJGVhXGldfbioiYVYHMmgRKHotU2ZibGNUVX8hE21mWAB4fBdaSEVhA3d%2BVnUNOgoFL3dTKXUFbBQLBlBzOkAWHlwVY0hmAGBtfwYfdHJKb114XRZwYgNvXRNJUWQ0GhIrAVNQF2lLbAQIdWBhEGkRKHYtYAIBeGNUWUYTEn5JXXROXyRcegJsZjJ2V2QoGxIVDWlgB2ZIbC0ifVRzckgXEnlyYwBiXVdVf1oQAnEAXXRgTydYdUVueQgAb2EzNAgFN39QL3VYWgYQfFdhBF8YE24uV2pmQ1dRSXIcEk9KY2BBTAlwak9cZhcGY18oLyBwAVFWBVtLdAcUT1FhF0IPBUAkVGVHBGFvAHsgKWVEXHRCYhdifQZvZQxDe2QKNxctK2pQFmVZbnETQXpiNmchAUAzb2VmZG1gY1omPE9lWl1gWglyeUV3ARQFUXUSOiYsBUpgBV9ZWgZ%2FWFYHAFkmAV82ZF9yRlcKZEYIBkAN

I have eliminated my url rewriter as the problem. However I have another httpModule that modifies html output, this is used to convert paths from

http://localhost/MyFile.aspx to http://localhost/MyApp/MyFile.aspx

this httpModule is the cause of my problem (switching it off fixes the manager). Need to find out why.

    
            /// Initialises the module and hooks up its event handler.  
        
            public void Init(HttpApplication application)  
        
            {  
        
            application.ReleaseRequestState += new EventHandler(this.ReleaseRequestState);  
        
            }  
        
            /// Handles the event raised after ASP.NET finishes executing all request handlers.  
        
            private void ReleaseRequestState(object sender, EventArgs e)  
        
            {  
        
            HttpApplication application = (HttpApplication)sender;  
        
            HttpContext context = application.Context;  
        
            HttpRequest request = context.Request;  
        
            HttpResponse response = context.Response;  
        
            if  (IsHtmlResponse(response))  
        
            {  
        
            response.Filter = new RootRelativePaths.OutputFilter(response.Filter);  
        
            }  
        
            }

my output filter:

    
            public class OutputFilter : BaseFilter  
        
            {  
        
            public OutputFilter(System.IO.Stream baseStream) : base(baseStream) { }  
        
            public override string Filter(string originalHtml)  
        
            {  
        
            //I've removed all the filters for testing, so just return what was sent  
        
            return originalHtml;  
        
            }  
        
            }

When I use Fiddler and click on one of the subfolders the url that is requested ( http://localhost/MyApp/Telerik.Web.UI.DialogHandler.aspx?DialogName=ImageManager&Skin=Default&Title=Image+Manager&doid=67bc3f99-e30d-4471-86df-12c627b546ed&dpptn=&dp=ZHViRm5gY1kQAnEAWHt7RRN%2bcgdiYjVGeXYwBSYsBVBQBWV3WhYMWm9xEF0YAHY3V2UBT3h9a10nDXlcdXd7RRN%2bcgdiZTZ8VwAKKyYGLw9rGmFBWnNzZ2xuEF4OA2ItVHp6WXh8cEYKdW1AW3RgdSZbAQVbAxRIZAB9NiAGFUxWBHFIWnIcRm9xFEgUDlQybGcBXVZvZEYXKHFDWgFjRQh1TwFqZndZbF88LxIGKwhQFXlEYRYqRWFxLkQjdFQwbEtMcm1vSU8fFkBKdXVkTyFhbQFsZgQFY2oGMCZzBVJgL19CYhcIRlBbF0IQK342VQBhRnlrRkwIAWYEdHd3ARZhCV5iAxR3b3UocyZyCX5TFUtdbXIQW29bLgUOA2ItVHp6WXh8cEYSAXljWwFkbghhUwFsdgREbwESKx5zFkpgL3VCW3MTRXh1OlAUPGp1YF5ue2RsRXMnKHFZW3RgcCdhclpidhBdb3cOKydzFW1WCl9CYhkIWW9hFAEOA2ItVHp6WXh8fEYTDX0BY2dCYx9hQFpbXC5DeVkWMx0WO09ocmFdYiwqQ1RuEEEgdAwwZHVYXVZ%2fCFsTDVtHY2YDXidhbUVqXARCVgARMAkCO25gc2lLby0ufVZxBAQMEFAkYAJYBGJUZ0chE31obF10XRdMVANsdjZiVnQoGyEJGVh%2fBwYDYSxzZVBhC0gnDkgIVwBMBWNuVV4nA2Voa11gbBMEakVhAzZiVnQoGyEJGVhXGldfbioiYVYHMmgRKHotU2ZibGNUVX8hE21mWAB4fBdaSEVhA3d%2bVnUNOgoFL3dTKXUFbBQLBlBzOkAWHlwVY0hmAGBtfwYfdHJKb114XRZwYgNvXRNJUWQ0GhIrAVNQF2lLbAQIdWBhEGkRKHYtYAIBeGNUWUYTEn5JXXROXyRcegJsZjJ2V2QoGxIVDWlgB2ZIbC0ifVRzckgXEnlyYwBiXVdVf1oQAnEAXXRgTydYdUVueQgAb2EzNAgFN39QL3VYWgYQfFdhBF8YE24uV2pmQ1dRSXIcEk9KY2BBTAlwak9cZhcGY18oLyBwAVFWBVtLdAcUT1FhF0IPBUAkVGVHBGFvAHsgKWVEXHRCYhdifQZvZQxDe2QKNxctK2pQFmVZbnETQXpiNmchAUAzb2VmZG1gY1omPE9lWl1gWglyeUV3ARQFUXUSOiYsBUpgBV9ZWgZ%2fWFYHAFkmAV82ZF9yRlcKZEYIBkAN)

Says that there is "No Entity Body", I also get a "no element found" Javascript error on Firefox Error Console

Can anyone see/suggest anything??

Rumen

Admin

14323 posts

Posted 10 Jun 2010 Link to this post

Hi Ric,

My suggestion is to make a check for the Telerik Dialog handler (Telerik.Web.UI.DialogHandler.aspx) in the
if (IsHtmlResponse(response))
{
....
}

clause and to not do anything in it. This should fix the problem.

Kind regards,
Rumen
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.

Dimo

24 posts

Member since:
Nov 2008

Posted 30 Aug 2010 Link to this post

I have problem with inserting images from a folder in RadEditor, the application is hosted on 1and1.com and when it is standart folder it works fine when I click on image button to open image selection dialog.
But when I changed the folder permissions to be possible to upload and save files in this folder (giving it read and write permissions from 1and1.com web admin pane), the picture selection dialog is not shown and I receive as shown in the screenshot attached:
I am using Telerik.Web.UI.dll version 2009.3.1314.20
On my local machine I have no any problems like this, so I suppose it could be some folder sequrity/permissions issue.
Please help, its urgent:)

error.png

Dimo

24 posts

Member since:
Nov 2008

Posted 30 Aug 2010 Link to this post

also when I re-upload web.config, it started to work again - as expected and dialog is loaded!
Do you see any reasons and why sometime it doesn't work, how this can be fixes?

Dimo

24 posts

Member since:
Nov 2008

Posted 01 Sep 2010 Link to this post

Also, what is the reason of appearing this error message:

"Cannot deserialize dialog parameters. Please refresh the editor page.

Error Message:Invalid character in a Base-64 string."

shown on
http://demos.telerik.com/aspnet-ajax/editor/examples/xhtmlvalidatortrackchangesformatcodeblockdialogs/defaultcs.aspx
see screenshot.

err.png

Rumen

Admin

14323 posts

Posted 02 Sep 2010 Link to this post

Hi Dimo,

The "The system cannot find the file specified" error is most likely due to some monitoring program such as WebSense or a Proxy server which decrease the URL length of the Dialog handler for example to 1700 symbols. To fix the problem contact your network administrator and increase the allowed URL length to 2000 symbols. You can find more information in these articles: Blank Dialogs Problem and What is the maximum length of a URL?.

If you get the following error "Web.config registration missing! The Telerik dialogs require a HttpHandler registration in the web.config file", before receiving the "The system cannot find the file specified" then see this article.

As to the "Invalid character in a Base-64 string." error see this article: Cannot Deserialize Dialog Parameters. Invalid character in a Base-64 string. The problem in the live demos is due to that the demos on our site are periodically reset to clean the changes made by the user and you should restart your browser when you get such an error.

Greetings,
Rumen
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items

Dimo

24 posts

Member since:
Nov 2008

Posted 04 Sep 2010 Link to this post

Hi, Rumen!
I interest expecialy from "The system cannot find the file specified" . I dont thing before it been other error message. For some reason some time the image browse dialog not shown, but error message appeares. (as shown in the previously uploaded from me screenshot)
And what is the very strange for me, after I re-upload the web.config file (which cause as I know the web application to be restarted), the dialog start to open normaly (for some time).
Could be there some memory/loading/cash problems? For my client may be this is unstabile behavior and it realy urgent for the project to be completed. So any help on resolving this issue is from key importance.
I use 1and1.com hosting and also rights to the folder was changed to be with write rights, so to be possible image uploading.

working.png

Dobromir

Admin

1633 posts

Posted 08 Sep 2010 Link to this post

Hi Dimo,

As Rumen said in his previous answer, the most possible reason for this problem to occur is that some monitoring program decrease the URL length of the Dialog handler. Have you contacted the webhosting regarding this issue?

In addition, we are not aware of any problem of RadEditor to cause its dialogs to crash. Could you please open a support ticket provide sample project and / or a live url that reproduces the problem so we can investigate it further.

Regards,
Dobromir
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items

Dimo

24 posts

Member since:
Nov 2008

Posted 04 Nov 2010 Link to this post

When I try to open hyperlink screen handler I receive The system cannot find the file specified.
but this error is not shown in my deleloper machine.
What exactly have to be setup in order to avoid this error mesage? I use 1and1.com hosting
Image dialog and others opens already OK, but link and image map editor fails to open and
"The system cannot find the file specified. " message is shown.
is there some settings which can be made by code, and how can I exclude only image map editor from rededitor toolbox?

err.png

Dobromir

Admin

1633 posts

Posted 10 Nov 2010 Link to this post

Hi Dimo,

I am not quite sure what may cause only the HyperLink manager to display this error. Have you tried all the suggestions from this KB article? Could you please provide a live URL that reproduces the problem so we can investigate it further?

Also, could you please, send us the Fiddler’s log when loading the page with RadEditor and when loading the Image Manager?

You can find information of how to work with this useful tool at: http://www.ehow.com/how_5598400_use-fiddler-debugger.html and http://www.west-wind.com/weblog/posts/596348.aspx.

You can remove the ImageMap Editor tool from the toolbar using the approach provided in the following help article:
Removing Toolbar Buttons

Sincerely yours,
Dobromir
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items

Dimo

24 posts

Member since:
Nov 2008

Posted 10 Nov 2010 Link to this post

Hi, Dobromir!
From information given by fiddler, I have 404 error when trying to open hiperlink manager

http://mysitename.com/admin/Telerik.Web.UI.DialogHandler.aspx?DialogName=LinkManager&Skin=Outlook&Title=Hyperlink%20Manager&doid=52f76c21-c10b-45d3-8fe6-3ea4af4f348c&dpptn=&dp=ZBN2XBgpTi1%2FYQItbHpmDzhufwJqHgxBZnJqdlF%2BF0xZc2AoUgc7cxgTTjt3ZUQ%2BemtmHQZueHZnAQRYaXJuK2kLFEVqWXA3VXYWRwwHTiB7TGF0YEFuKjJtWQdRKwREUQZuBVFuC1pic2QobAINRiATAzthc2ksVGV6CC59YDJlDggcaRVMFmluOVpbWVo2ei8RRBgTTjd3BmEobEBYEQNhfzFRdHZYYQZUK1F%2BeFhufFozbBF2XCMTYzJ%2FW3U3VR9hFy96VRZhdxhXZC1QCFB%2BBwN2Yl4lYHQvBRcoYDNJYHkcY0N2DzBDQXRnATZ%2BUAdUG1ZxG1d1cQN2byl2ZyQTfzhIfkMJVx5cEztUHHFnKi51fRZQIn5VGwNtX1I3VwMJfA4TAwx8BnkSYUFQUAB%2BYzVRDghgUQZqMGRuKgduWHgQUnYnYyMSbHR0THk3UkB%2BFS9xQQ9hAwccZwZIDVdscGNsbF4LZz4RARUReHJ3B3Y%2BYEN6DzF%2Fd3RkKhNVVxdIGmVTA1xaYWw%2BYgENdxQTZBl%2BWH0sYB0BKTVVRTJlEQtUVwZAKlJTAwJsY0YDVBIvbBcQeBF%2Fc2Y9YkFQLwN8HThmEgMaYRlQc2lhC0NhY04BVxMFRyN2Ujt4cXV0V25MIztuVTtpFTVafwVMDlELD15ac1pybxwRRCN2AxB0bmEremhuDABxYy1%2FAgNe

but when when open image manager, it it ok with status 200

http://dnrdiamonds.com/admin/Telerik.Web.UI.DialogHandler.aspx?DialogName=ImageManager&Skin=Outlook&Title=Image%20Manager&doid=52f76c21-c10b-45d3-8fe6-3ea4af4f348c&dpptn=&dp=ZCkvRxsRfDhPBVc%2BbHV%2BIAALGHFpEXcdZglyNVdULV1ibHwRUxwBWBUpcDV3ZUsDb3pMHjhqWjZ%2FAjZnURZ%2BLWlsF11ZbGQyVS8ZRCMDYBVJYWkpV3VTFzBUazJQdBdefgJAGn4IC0BiclU8VxA3cRsTTi1JcWUVb3VmCwFAVRRQKBRBfwV5MHwJF0NhY3w3bBEVQBgpYCp3cWUvZ0ByHjhvY3FWETpBUHNQL2lhEEVqWXA3VXYWRww9ThROWGUoeR1MDABUSXBqESZBfwRiK1FxD1p0cHc3YSggBCUCbBZ5YgNzYx9iDAFUYy5mAQQdVwZuOlFXDEVufHx1bBc0Qw0AQg90blsSVWpMEjtufwZSETpBZnNUdWlqOXFhY04%2BbBc0TA0AfzZjclQze2lAMThuVS1QKy5ffypqM2puOUBiBGQobCkvQSAcZDFPBAcxZGpYDAB%2BFC9lDi5aaRQNK1FuFEVqWXA3VXYWRwwHThZ%2FB2k%2BYUFcLwF%2Ba3R9ECpMZXFUcmVVF0RcYnwcYyoBXxM%2BWnR5cUcXVWtYPAdxdyB%2BA3cfaiwNEFZuCE9dfEYJV3Y7BBYSUipPcGEcZENiPjQLfzJqdDZ%2BUAdUG1ZxG1ddbFIqYC8nYyJ1Rhh%2BWHEsU3liPTVVSQtXEBh7UnJ2CWFVMUVhBgMLVQMKTQ8AWg9MXXV3Yhx5VAdSVTBhHjJjZQd%2BcmduMXRbBFoCYi4FXRICfzl0BAISeXp%2BEDRTaypgAzJCaip2cGkIF39uWVotZHY7RRQ%2BfBZjYGkMeXV%2BBTRDfHRnEBBnVgdIN2FUOXldWVJwYikzYyASWhR5W0cLZ3kEXS0JVTdqdAReUhlIK1d%2BLUBaWHQsUgMkRxMpcDJOBGY3e25DUzBhRXFpHghYahZABlJuB0VaBlI%2BYwMFBCAHTgZ0YUs%2BbH5DEy59WRdQATpbahZqEmphE1lbTU4RVSoVWA0AdzJiBmUxb3p%2BFzhsezVqKxRGaQZuKGYLNUZaWns3ZCkFRyJ2YzJgT0sRVUNiCC0JezRqEQheaRRUN2puJVpqY2Q0UgN6TQ0BbClPfn0oeml5FzRxZ3BpEjZ6UhZucGZ%2BBwZZfHs3YAwJBRsXQTZhcGEBZUZQDC9SXRhqLSp6ZxQJMX1hMWxuWWQcbAInZxIDfAh4WkMTe0F%2BHjVtYyt8EAB%2FYxUIdGFudF5hWU4oYAMrBSMTfDR0YV83YmpYEQMLQTRpPzpqahZAOWlqNkx0cmQ9UhMWCQ%3D%3D

is that related to some specific settings in web.config?
here is file based on the web.config file which I use now. http://www.finansi.eu/Web.config

Nathan

6 posts

Member since:
Oct 2010

Posted 13 Nov 2010 Link to this post

I am having this same problem, but i am running DNN 5.5.1 any one have any ideas.

PLEASE HELP

Dimo

24 posts

Member since:
Nov 2008

Posted 13 Nov 2010 Link to this post

I submited ticket, containing test links related to this issue.
ticket ID is: 366473

Dobromir

Admin

1633 posts

Posted 15 Nov 2010 Link to this post

Hi Dimo,

I already answered your ticket on the subject. For convenience I will post my answer here as well.

This problem is most probably caused by the web server's limitation of the URL length. By design, RadEditor's dialogs are configured to send their parameters using POST method if they exceed 2000 characters. Could you please try the following JavaScript workaround and see if the problem still occurs?

<script type="text/javascript">

function setUrlLength(editor)

{

editor.get_dialogOpener()._dialogUrlLengthLimit = 200;

}

</script>

<telerik:RadEditor ID="RadEditor1" runat="Server" OnClientLoad="setUrlLength" .../>

This will configure dialogs to POST their parameters to decrease the URL.

Greetings,
Dobromir
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items

Dimo

24 posts

Member since:
Nov 2008

Posted 15 Nov 2010 Link to this post

Thank you, this javascript code solve the problem!

Nathan

6 posts

Member since:
Oct 2010

Posted 15 Nov 2010 Link to this post

where would I find this?

Dobromir

Admin

1633 posts

Posted 16 Nov 2010 Link to this post

Hi Nathan,

Please see my answer to this thread from 11/15/2010.

Kind regards,
Dobromir
the Telerik team

Browse the vast support resources we have to jumpstart your development with RadControls for ASP.NET AJAX. See how to integrate our AJAX controls seamlessly in SharePoint 2007/2010 visiting our common SharePoint portal.

Nathan

6 posts

Member since:
Oct 2010

Posted 16 Nov 2010 Link to this post

I am sorry I am not a programmer, I am not sure were to find the file with that line of code.

Nathan

6 posts

Member since:
Oct 2010

Posted 16 Nov 2010 Link to this post

If there is suppose to be in the web.config. I do not have this there.

Dimo

24 posts

Member since:
Nov 2008

Posted 16 Nov 2010 Link to this post

Hi, Natan!
You have to alter the aspx code of the page, where this error is displayed.

Nathan

6 posts

Member since:
Oct 2010

Posted 16 Nov 2010 Link to this post

I just wanted to make sure you understand that we are talking about he Telerik editor that comes with DNN 5

Dobromir

Admin

1633 posts

Posted 19 Nov 2010 Link to this post

Hi Nathan,

I already answered to your other thread on the subject.

Best wishes,
Dobromir
the Telerik team

Browse the vast support resources we have to jumpstart your development with RadControls for ASP.NET AJAX. See how to integrate our AJAX controls seamlessly in SharePoint 2007/2010 visiting our common SharePoint portal.

Shri

20 posts

Member since:
Aug 2012

Posted 03 Mar 2011 Link to this post

I have inserted rad editor in my page :

<

telerik:RadEditor ID="reContentHtml" runat="server" EnableResize="False" EnableTheming="False"

Height="304px" MaxHtmlLength="4000" ToolbarMode="ShowOnFocus" ToolsFile="~/XML/Custom2.xml" Width="650px">

<ImageManager ViewPaths="~/ContentImages/View,~/ContentImages/Update"

UploadPaths="~/ContentImages/View,~/ContentImages/Update"

DeletePaths="~/ContentImages/Delete">

</ImageManager>

</CssFiles>

<Content></Content></telerik:RadEditor>

I am trying to add images by image manager, but controls are not enabled on dialog box.
You can check in attached images.

Can any one help me? Thanks in advance.

Rumen

Admin

14323 posts

Posted 08 Mar 2011 Link to this post

Hi,

Could you please upgrade to the latest Q3 2011 SP2 (version 2010.3.1317) of RadControls for ASP.NET AJAX and see whether the problem still persists?

Please, also try the instructions in this article: http://www.telerik.com/support/kb/aspnet-ajax/editor/error-web-config-registration-missing-the-telerik-dialogs-require-a-httphandler-registration-in-the-web-config-file.aspx

Best regards,
Rumen
the Telerik team

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