AVIRA Antivirus detects error in my Microsoft Web Developer

Hi,
When I am using my Microsoft's Web Developer 2010, Avira Antivirus begins to create some errors.
The error happens when I try to start the web application in debug form.
Whenever I try to start the application, I get this message "Failed to create AppDomain.
However, the app runs very smoothly when I start it without debugging.
Here is a screenshot:

Why does this happen? Please help me out.
Thanks!
