Error rendering RadTreeList

[Sonia]

Hi,
I have a RadTreeList control in a web page. I get the following error when i change to "Design" view.

There was an error rendering the control.
[A] Telerik.Web.UI.RadTreeList cannot be cast to [B] Telerik.Web.UI.RadTreeList. Type A originates from 'Telerik.Web.UI,Version=2012.1.215.40, Culture=neutral, PublicKeyToken=121fae78165ba3d4' in the context 'LoadNeither' at location  'C:\user\myuser\AppData\Local\Microsoft\VisualStudio\10.0\ProjectAssemblies\dnsandqz01\Telerik.Web.UI.dll'.
Type B originates from 'Telerik.Web.UI,Version=2012.1.215.40, Culture=neutral, PublicKeyToken=121fae78165ba3d4' in the context  'LoadNeither' at location 'C:\user\myuser\AppData\Local\Microsoft\VisualStudio\10.0\ProjectAssemblies\m27i_m801\Telerik.Web.UI.dll'.

Does anyone know how i can solve it?
Thank you.

[Sonia]

I have solved it by following these steps:

• Remove the asp.net temporary files from C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files
• Close the file *.aspx
• Open again the file *.aspx
• Change to design view

• And voilà!