[TYPO3] Netcreators rating extension

[Custos Ostii]

Hello

I m tring to use netcreators rating extension but i ve this error in FE when i m rate a page

Error: bad check value

any comments about this piece of code class.tx_ratings_ajax.php I think that i have anything missconfigured but there isnt doc

        $check = t3lib_div::_GP('check');
        if (md5($this->ref . $this->rating . $data_str . $GLOBALS['TYPO3_CONF_VARS']['SYS']['encryptionKey']) != $check) {
            echo $GLOBALS['LANG']->getLL('wrong_check_value');
            exit;
        }

Thanks




       
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