Please help!mysql error number: 1060

[emuchina]

When I upgrade vbb 3.00 to 3.06,in step 2,we got a CGI timeout error,after I refresh that page,I got this error:

Step 2) Miscellaneous table alterations 2/4

Adding thumbnail size field to attachment table


There seems to have been a slight problem with the RomShare Forums database.
Please try again by pressing the refresh button in your browser.

An E-Mail has been dispatched to our Technical Staff, who you can also contact if the problem persists.

We apologise for any inconvenience.

Database error in vBulletin 3.0.1:

Invalid SQL: ALTER TABLE attachment ADD thumbnail_filesize INT UNSIGNED NOT NULL
mysql error: Duplicate column name 'thumbnail_filesize'

mysql error number: 1060

Date: Saturday 05th of February 2005 10:17:10 PM
Script: http://www.xxxx.net/install/upgrade13.php?step=2
Referer:
Username: webmaster
IP Address: xxxxxxx

Please help!

[emuchina]

The table "thumbnail filesize " already created,can I modifly the upgrade13.php , and delete this step,and continue?
Thanks

// Add thumbnail filesize so we know what it is when thumbnails are in the FS
$query[] = "ALTER TABLE " . TABLE_PREFIX . "attachment ADD thumbnail_filesize INT UNSIGNED NOT NULL";
$explain[] = $upgrade_phrases['upgrade13.php']['add_thumbnail_filesize'];

[Deaths]

You can also just delete the tables/fields which have been created in your PHPMYADMIN