getBlocks('Main') Not Working

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I try to use getBlocks to get block in Main area, but it seems print an empty array, anyone can help me?

This is my code :
$ts = $c->getBlocks('Header Image'); //This is working
$ts = $c->getBlocks('Main'); //This not working


Update :
Sorry, I'm not checking it, it has a layout so it just print empty array.
Problem solved.

goesredy