Debugging Problem

Hi all.
This might be a stupid question.
However, I really appreciate for those who care to explain.
I am a new to VB.net.
I made simple program.
There is an error while trying to run the project.
The error states that:

Error while trying to run project; unable to start debugging on the web server. Debugging failed because integrated Windows authetication is not enabled.

How can I enable the Windows authentication ?

The project can be run if I start the project without debugging.

Can anyone explain to me why this problem occur?

Thanks in advance.

Are you using LocalHost (IIS). If so then have you tried restarting the IIS and try executing aspnet_regiis.exe -i.

aspnet_regiis can be found in "%windir%\Microsoft.NET\Framework\versionnumber