The debugger could not find the application root for the project. This can occur if:
Currently, your Microsoft® Visual InterDev™ options are set to enable server debugging automatically when you start the debugger. Visual InterDev prompts you to disable these options.
Choose No if you want to maintain these option settings. Choose Yes if you want to turn off these options. In that case, you should set debugger options manually for your IIS applications to be able to debug server script. For details about server debugging options, see Debugging Server Script.