it looks like your get_terms() call is incorrect, the argument is not an array and you have a typo in taxonomy name (‘product_category’ instead of ‘product_categories’) it should be
<?php
$terms = get_terms( array(
'taxonomy'=>'product_categories',
'hide_empty'=> false
) );
?>
If this will not help it would be best if you could let us know if you are seeing any error message and if you do paste the error here.
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