Mautic REST API using custom getCustomList process

HI,
i was trying extract the contact from a particular period using mautic REST API using contact API.

$queryBuilder = new QueryBuilder();
$queryBuilder->setSelect("select * from leads");
$queryBuilder->setWhere($queryBuilder->expr()->eq('dateAdded', '2019-04-27 06:11:23'));
$contacts = $contactApi->getCustomList($queryBuilder);

When i execute and print the above query it returns like

Array
(
    [select] => select * from leads
    [where] => Mautic\QueryBuilder\WhereBuilder Object
        (
            [clauses:protected] => Array
                (
                    [0] => Array
                        (
                            [col] => dateAdded
                            [expr] => eq
                            [val] => 2019-04-27 06:11:23
                        )
                )
            [composite:protected] => 
        )
)

but after executing the query it produces the following error in my system

[2019-06-13 04:42:55] mautic.ERROR: Uncaught PHP Exception Symfony\Component\HttpKernel\Exception\HttpException: "signature_invalid" at /var/www/html/mautic/vendor/willdurand/oauth-server-bundle/Service/OAuthServerService.php line 244 {"exception":"[object] (Symfony\\Component\\HttpKernel\\Exception\\HttpException(code: 0): signature_invalid at /var/www/html/mautic/vendor/willdurand/oauth-server-bundle/Service/OAuthServerService.php:244)"} []

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Start by reproducing the contact API call using getCustomList with the shown QueryBuilder input, then inspect OAuthServerService.php at line 244 and the request path that invokes it. Compare this failing request with a working REST API request; done means the cause of signature_invalid is identified and the custom process has a documented resolution.