How to display a block name ver 5.7? setBlockWrapperStart

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I woud like to display a block name like below into my original theme. It works with concrete5.6.

$a = new Area('Main');
$a->setBlockWrapperStart('<div class="%4$s">',true);
$a->setBlockWrapperEnd('</div>');
$a->display($c);


But it doesn't work with concrete5.7. Dose anyone know how to display a block name?

cloud9works