I utilize a shared website hosting account, which runs under Linux, to host my installation of vBulletin 4.0.7 Publishing Suite. I recently discovered that the website's error log contains thousands of entries for "File does not exist: /home/user/public_html/assets, referer: http://www.my-domain-name.com/forums/forum.php".

The most recent entry is as follows:
[Fri Sep 24 12:33:54 2010] [error] [client] File does not exist: /home/username/public_html/assets, referer: http://www.domain-name.com/forums/forum.php
1. Is "assets" a file or directory?

2. What is vBulletin's need or purpose for the "assets" file or directory?

3. Why wasn't the file or folder "assets" created as a part of the initial installation of vBulletin 4.0.0 Publishing Suite, or any of the updates leading to version 4.0.7?

4. What needs to be done to remedy this particular problem?

Thank you.