phpmydirectory issue

[vb.help]

Recently i added a login module for phpmydirectory and i keep getting the following error

Can anybody explain what this salt means ?

Database error in vBulletin 4.1.5:

Invalid SQL:
SELECT id, pass, salt FROM pmd_users WHERE login='Wakroorgo';

MySQL Error : Unknown column 'salt' in 'field list'
Error Number : 1054
Request Date : Thursday, September 1st 2011 @ 02:39:42 PM
Error Date : Thursday, September 1st 2011 @ 02:39:42 PM
Script : http://www.mydomain.com/login.php?do=login
Referrer : http://www.mydomain.com/register.php
IP Address : XX.XXX.XX.XX
Username : Wakroorgo
Classname : vB_Database
MySQL Version :

[kh99]

Salt: http://en.wikipedia.org/wiki/Salt_(cryptography)

But that probably won't help with the error. The error says that your pmd_users table is missing that column. If it's something you just installed, that doesn't make sense.

[vb.help]

yes i installed phpmydirectory and it doesn't throw any error while installation and now i get this... dont know how to solve it ...