A lot of scripts use a function called "parent paths". If you are running one of these scripts and on check found logs entries like "'ASP 0131 Disallowed Parent Path". Then, you have to enable the parent paths for your domain.
By default, this feature is not enabled. To enable parent paths you would follow the steps below:
1. Login into Plesk account
2. Goto Home.
3. Click on your domain name (center window)
4. Press on Web Directories Icon.
5. Click on Preferences.
6. Tick the box to Enable Parent Paths.
7. At last, click "OK".