error
sometime it is a little buggy the wizard. So first would be for you to define a mysql connection file if you have not done so,On line 3 <?php require_once('../../Connections/.php'); ?> the connection file is just .php so the page has no connection to your database. whatever the name of your connect file is for example connectdatabase.php the dataassist pages will use that file name for the delete, insert etc functions. So line 26 looks like this
$DeleteQuery = new WA_MySQLi_Query($);
if your connection file was named connectdatabase.php then line 26 would look like
$DeleteQuery = new WA_MySQLi_Query($connectdatabase);
