Disallowed Path Characters in IIS7

This error is often seen in classic ASP when the site is loaded for the first time,
 
Server.MapPath() error 'ASP 0175 : 80004005'
Disallowed Path Characters

To resolve this error

1) To see the real error, go to MMC and load the IIS Manager snap-in and go to your website. Double click on "ASP" in the Features View tab, drill down.

2) Expand the ' Behaviour'  section and set the value of ' Enable parent paths' to 'true'.