Auto-attach to process '[3716] aspnet_wp.exe' on machine 'xxx' failed. Error code 0x8013134b. The project is not configured to be debugged

i got a error message "Auto-attach to process '[3716] aspnet_wp.exe' on machine 'xxx' failed. Error code 0x8013134b. The project is not configured to be debugged " when i try to debug a downloaded sample source code. My project already has a Web.config file, and the debug attribute is set to true in the section of the Web.config file

I'm able to solve this problem by set the Execute Permissions for the web folder:
1. Start Internet Services Manager, and then click the project that you are trying to debug.
2. Right-click the project, and then click Properties.
3. Click the Directory tab.
4. If None is selected in the Execute Permissions list, click Scripts only, and then click Apply.