How to show products attributes in loop?

I added custom attributes to my products, and I would like to show one of these on the product loop page(loop/price.php). The attribue name is: “garan”.

$garanvalues = get_the_terms( $product->id, 'pa_garan');

foreach ( $garanvalues as $garanvalue ) {
    echo $garanvalue->name;
    var_dump($garanvalue);
}

I used the code above, but the var_dump output the following:

array(1) {   ["invalid_taxonomy"]=>   array(1) ..

I hope you know solution. Thank you very much!