The error is occurring as the $_GET array doesn’t have the item $_GET[‘do’] in it. Therefore it throws this notice. To check if something exisits in the array try:
if( isset( $_GET['do'] ) )
$do_that = $_GET['do'];
else
$do_that="";
or a cleaner method would be to use short hand notation
$do_that = ( isset( $_GET['do'] ) ) ? $_GET['do'] : '';
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