Always throwing exception as "errors”:“Not Found” even though SKUs present in inventory php-shopify

Shopify Discussion
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I tried this $shoppify->ProductVariant->search(“sku:{$sku}”) but it always gives output as Uncaught PHPShopify\Exception\ApiException: {“errors”:“Not Found”} even though sku present in inventory.

Note: used composer to install latest phpclassic/php-shopify

Link to github: https://github.com/phpclassic/php-shopify

example:

$sku="example-shirt-s";

var_dump($shopify->ProductVariant->search("sku:{$sku}"));

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But I just tried with to get list of products with below APIs then it got list of products :

$products = $shopify->Product->get();

 var_dump($products);