Some error when open Webpage .

See more:

ASP.NET

When I open my Visual Studio 2005 for C#.NET, and when I double-click
on a Form, the error pops up:

"Extensibility DTE object unavailable."

Below are messages under the error:

at EnvDTE.Project.get_DTE()<br />
at<br />
Microsoft.VisualStudio.Design.Toolbox.ProjectAutoT oolboxManager..ctor(AutoToolboxManagerService<br />
ownerService, IServiceProvider provider, IVsHierarchy hierarchy,<br />
Boolean& keepMe)<br />
at<br />
Microsoft.VisualStudio.Design.Toolbox.AutoToolboxM anagerService.GetAutoToolboxManager(Object<br />
vsHierarchy)<br />
at<br />
Microsoft.VisualStudio.Design.Toolbox.AutoToolboxM anagerService.GetAutoToolboxManagerFromHost(IDesig nerHost<br />
host)<br />
at<br />
Microsoft.VisualStudio.Design.Toolbox.AutoToolboxM anagerService.OnDesignerLoadComplete(Object<br />
sender, EventArgs e)<br />
at System.EventHandler.Invoke(Object sender, EventArgs e)<br />
at System.ComponentModel.Design.DesignerHost.OnLoadCo mplete(EventArgs<br />
e)<br />
at<br />
System.ComponentModel.Design.DesignerHost.System.C omponentModel.Design.Serialization.IDesignerLoader Host.EndLoad(String<br />
rootClassName, Boolean successful, ICollection errorCollection)<br />
at<br />
System.ComponentModel.Design.Serialization.BasicDe signerLoader.OnEndLoad(Boolean<br />
successful, ICollection errors)<br />
at<br />
System.ComponentModel.Design.Serialization.CodeDom DesignerLoader.OnEndLoad(Boolean<br />
successful, ICollection errors)<br />
at<br />
System.ComponentModel.Design.Serialization.BasicDe signerLoader.System.ComponentModel.Design.Serializ ation.IDesignerLoaderService.DependentLoadComplete (Boolean<br />
successful, ICollection errorCollection)<br />
at<br />
System.ComponentModel.Design.Serialization.BasicDe signerLoader.BeginLoad(IDesignerLoaderHost<br />
host)<br />
at System.ComponentModel.Design.DesignerHost.BeginLoa d(DesignerLoader<br />
loader)