Have you installed the latest version of the BETA lately? That should be updated in the newest version.
To fix it after the fact, I'd just delete all of the code so you just have:
<select name="search_value" id="search_value">
<option value="0" selected>Please select one...</option>
Then go to window->properties and use the lightning bolt to populate the select list from the recordset. That should rewrite all of the code with MySQLi at that point.