missing registration from web config

[Benjamin]

i received the error about Telerik dialog require http handlers in web.config.

i have added the following to my web config

previously i was developing as a asp.net web application and i did not have this issue.

after integrating the ascx file which contain the Editor control into Sharepoint 2013 as a custom web part, i encounter this issue

01.<system.web>
02.    <httpHandlers>
03.      <add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false" />
04.      <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false" />
05.      <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false" />
06.    </httpHandlers>
07.</system.web>
08.  <system.webServer>
09.<handlers>
10.<remove name="Telerik_Web_UI_WebResource_axd" />
11.      <remove name="Telerik_Web_UI_SpellCheckHandler_axd" />
12.      <remove name="Telerik_Web_UI_DialogHandler_aspx" />
13.      <remove name="Telerik_RadUploadProgressHandler_ashx" />
14.<remove name="ChartImage_axd" />
15.      <!-- This is the primary handler used to fetch most of the needed resources -->
16.      <add name="Telerik_Web_UI_WebResource_axd" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" preCondition="integratedMode" />
17.      <!-- Only needed for RadSpell and RadEditor's spell checking -->
18.      <add name="Telerik_Web_UI_SpellCheckHandler_axd" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" preCondition="integratedMode" />
19.      <!-- Only needed for controls that have complex dialogs like RadEditor, RadImageEditor -->
20.      <add name="Telerik_Web_UI_DialogHandler_aspx" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" />
21.      <!-- Only needed if RadAsyncUpload, RadProgressArea/RadProgressManager or the obsolete RadUpload are used -->
22.      <add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" preCondition="integratedMode" />
23.      <!-- Only needed if the obsolete RadChart control is used -->
24.      <add name="ChartImage_axd" path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" preCondition="integratedMode" />
25.</handlers>
26.  </system.webServer>

[Vessy]

Hi Benjamin,

Can you try replacing Telerik.Web.UI.DialogHandler.aspx with Telerik.Web.UI.DialogHandler.axd in your web.config file and see how it goes?

If this does not help, I would advise that you take a look at the following KB article that contains information about the usual scenarios in which the problem is encountered and how to deal with it:
​ Error: Web.config registration missing! The Telerik dialogs require a HttpHandler registration in the web.config file.

Regards,
Vessy
Telerik by Progress