Cannot access admin panel after migration vbulletin

Upload tools.php from the do_not_upload folder into your admincp folder. Point your browser to it and reset the cookie domain. You cannot simply do that to one field in the database.

Before pointing the browser to the page , add the below given code in includes/config.php
.Add this line right under <?php

define(‘DISABLE_HOOKS’, true);

That would fix the issue