Visual InterDev
Debugging is not enabled for this Microsoft® Internet Information Server (IIS) application, and the Microsoft® Visual InterDev™ project settings are not set to automatically enable debugging. You will not be able to set breakpoints or perform other debugging functions in server script. However, you will be able to debug client script.
Do you want to continue launching the debugger? If you choose Yes, you can view the file in the debugger and in the browser, but will not be able to debug.
For details about server debugging options, see Debugging Server Script. For information about manually enabling debugging on the server, see the topic "Enabling ASP Debugging on the Server" in Troubleshooting.