Problem delivering mail to mail-in database

I am trying to send an email into a mail-in database. In the NAB,I created a mail-in database configuration

Mail-In Name: IAR

ServerName: epicentre/epitome

File Name: dev\sch\iar-web.nsf

The file is in the folder dev in the sch subfoler in a Windows machine

When I tried to send a mail to IAR, the server console showed the following message:

“Error delivering to Epicentre/Epitome iar-web.nsf; File does not exist”

Did I miss any step?

Thanks for your advice.

Subject: Problem delivering mail to mail-in database

Dumb question: Is the dev folder under the Domino\Data folder?