Members cant join after upgrade

HI Guys, we just upgraded the site to 6.1.1 and members cant seem to join now.  I keep getting this message emailed. Any help from some of you experts...please...lol


Database error in Free Greek Dating
Query:

SELECT `ID`,            `Tags` AS `Tags` FROM `Profiles`        WHERE `LastModified` >= '2008-05-15 09:30:08' OR `LastReg` >= '2008-05-15 09:30:08' AND `Status` = 'Active'


Mysql error:
Unknown column 'LastModified' in 'where clause'

Found error in file /home/freegree/public_html/periodic/tags.php
at line 36. Called db_res function
with erroneous argument #0

Debug backtrace:
Array
(
   [1] => Array
       (
           [file] => /home/freegree/public_html/periodic/tags.php
           [line] => 36
           [function] => db_res
           [args] => Array
               (

                   [0] => SELECT `ID`,            `Tags` AS `Tags` FROM `Profiles`        WHERE `LastModified` >= '2008-05-15 09:30:08' OR `LastReg` >= '2008-05-15 09:30:08' AND `Status` = 'Active'

- Show quoted text -
               )

       )

)


Called script: /home/freegree/public_html/periodic/tags.php

Request parameters:
Array
(
)


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