cURL error 60 is going while using google auth api

Question

GuzzleHttp \ Exception \ RequestException
cURL error 60: SSL certificate problem: unable to get local issuer certificate
(see http://curl.haxx.se/libcurl/c/libcurl-errors.html)

I'm using google+ api and this error is not going even after adding cacert.php and modifying php.ini

curl.cainfo = "‪C:\xampp\php\extras\ssl\cacert.pem"

xampp server
windows