Hello, 

I have used a RadScheduler on my SharePoint 2010 site with IE8. But every time I try to navigate to "Day", "Week" and "Month", A script error pops-up. I am using Ajax for each request,
 
I am attaching a sample of the project and the webconfig.
In the sample, To recreate the issue, Add the webpart to your page. Click "Month", Then a postback will occur(This does not happen in my developing aaplication). Afterwards, select "Day" or "Week". It wont navigate to either of them and there will be a script error.
To get the script error, use IE developer tools and start debugging. Do the same steps as told earlier, you will see the script error then.

I am attaching an image of the script error what happens when I first select "Day", Then "Week".

I have added the RadScriptManager to the master page.

*Removed Link*

Hello Hemika,

 
It looks like the issue is caused by the ajax manager on the page. I will recommend you to review this documentation article where is explained how RadAjaxManager should be defined in Sharepoint from the code behind.

Hope this will be helpful.

Kind regards,
Plamen
the Telerik team

This was fixed by updating sharepoint version.