" SCRIPT5022: NoModificationAllowedError"
After that I overrided function "Telerik.Web.UI.Overlay.prototype" by the following code::
Telerik.Web.UI.Overlay.prototype = { initialize: function () {
var _13f = document.createElement("div");
_13f.innerHTML = "<iframe>Your browser does not support inline frames or is currently configured not to display inline frames.</iframe>";
this._element = _13f.firstChild;
this._element.src = "javascript:'';";
this._targetElement.parentNode.insertBefore(this._element, this._targetElement);
if (this._targetElement.style.zIndex > 0) {
this._element.style.zIndex = this._targetElement.style.zIndex - 1;
}
this._element.style.position = "absolute";
this._element.style.border = "0px";
this._element.frameBorder = 0;
this._element.style.filter = "progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)";
this._element.tabIndex = -1;
this.updatePosition();
}, dispose: function () {
if (this._element.parentNode) {
this._element.parentNode.removeChild(this._element);
}
this._targetElement = null;
this._element = null;
}, get_targetElement: function () {
return this._targetElement;
}, set_targetElement: function (_140) {
this._targetElement = _140;
}, updatePosition: function () {
this._element.style.top = this._toUnit(this._targetElement.style.top);
this._element.style.left = this._toUnit(this._targetElement.style.left);
this._element.style.width = this._targetElement.offsetWidth + "px";
this._element.style.height = this._targetElement.offsetHeight + "px";
}, _toUnit: function (_141) {
if (!_141) {
return "0px";
}
return parseInt(_141) + "px";
}
};
Now, I am facing another error:
"SCRIPT5007: Unable to get property 'documentElement' of undefined or null reference"
I think all these errors are coming due to IE document Mode: standard is not handling these telerik dlls of above mentioned version
So, any suggestion or solution is welcomed
12 Answers, 1 is accepted

In 2009 there was no IE10 - so I suppose that it is not supported in there.
Since IE10 is still in release preview phase - I suppose that even the latest Telerik version can have a few issues under it.

I upgraded telerik dlls from version 2009.2.826.35 to 2012.2.607.35. Now, its working.
Thanx :)

You should upgrade RadControls for asp.net ajax to version 2012.2.607 or higher. Here are detailed steps how to upgrade to another version or license.
Regards,
Helen
the Telerik team

I am having similar issue with IE 10. I am using Telerik (version 2010.3.1317.20) on asp.net 2.0 website. As this is the last supported version from Telerik for asp.net 2.0 websites, I am unable to update to the latest version.
Any other help will be really appreciated. Thanks
Error: "SCRIPT5007: Unable to get property 'documentElement' of undefined or null reference
Telerik.Web.UI.WebResource.axd, line 151 character 2"
Regards,
Chintan Desai
In 2010 when we released our 2010.3.1317 version, there was no IE10. We provided support for it afterwards.
One possible solution is to use the IE9 meta tag:
http://stackoverflow.com/questions/14382636/how-to-force-ie10-to-render-page-in-ie9-document-mode
Kind regards,
Helen
the Telerik team

We have tried to force meta:
<meta http-equiv="X-UA-Compatible" content="IE=9" />
and also other values, like EmulateIE9, 8, 7...
But the error does not disappear!
Do you have WORKING workarounds for "Unable to get property 'documentElement' of undefined or null reference" issue in IE10??

Before posting, I had already tried to set meta tags for IE 9 and I have also tried [cscript adsutil.vbs set w3svc/HttpCustomHeaders "X-Powered-By: ASP.NET" "X-UA-Compatible: IE=9"] on the server as suggested in http://stackoverflow.com/questions/14022545/telerik-datepicker-in-ie-10-is-not-working but with no luck.
As most of the computers have automatically upgraded to IE 10, we would like to know urgently what else we could try to make telerik controls to work. Issues being with controls like RadCombo and RadWindow for me (Radbutton works though).
Thanks for your help.
Regards,
Chintan
You may try the following:
http://www.anthonysblog.co.uk/post/2013/03/05/Telerik-Rad-controls-not-working-with-Internet-Explorer-10
Kind regards,
Helen
the Telerik team

This does not work either.
Do you have any other solution instead of paying 1200$ to have the upgrade version ?
Thanks
We are aware of an IIS known issue for IE10 that might be related to the unwanted behavior you are experiencing on your site. There is a patch provided by Microsoft that is necessary to be applied to the server.
For .NET 4.0 check this one: http://support.microsoft.com/kb/2600088
For .NET 2.0:
http://support.microsoft.com/kb/2600100 for Win7 SP1/Windows Server 2008 R2 SP1, Windows Vista/Server 2008, Windows XP/Server 2003
http://support.microsoft.com/kb/2608565 for Win7/Windows Server 2008 R2 RTM
You could find more information at various places on the internet like:
If this solution doesn't help you please try to isolate the issue in a sample page that matches your setup with detailed reproduction steps, so we will be able to reproduce and examine it locally on our site.Regards,
Misho
the Telerik team

I found this post while I was looking for a solution to my DNN6 website. The error was (only in IE10)
SCRIPT5007: Unable to get property 'documentElement' of undefined or null reference
I tried almost solutions suggested here, but didn't work for me. So let me share with you what I did to solve this:http://www.40fingers.net/WeblogsNews/Weblogs/tabid/58/ID/123/language/nl-NL/DotNetNuke-6-and-Internet-Explorer-10.aspx
Worked great for me!