Can’t add a form

I can’t style your in-house form to my designer’s satisfaction, so thought I would try the plugin as recommended by CC tech support. When I try to add a new form, the whole page explodes with a ton of errors:

( ! ) Fatal error: Uncaught exception ‘GuzzleHttp\Ring\Exception\RingException’ with message ‘cURL error 60: SSL certificate problem: unable to get local issuer certificate’ in C:\Users\becky\Documents\Websites\garfieldconservatory.dev.cc\main\wp-content\plugins\constant-contact-forms\vendor\constantcontact\guzzlehttp\guzzle\src\Exception\RequestException.php on line 51
( ! ) GuzzleHttp\Exception\RequestException: cURL error 60: SSL certificate problem: unable to get local issuer certificate in C:\Users\becky\Documents\Websites\garfieldconservatory.dev.cc\main\wp-content\plugins\constant-contact-forms\vendor\constantcontact\guzzlehttp\guzzle\src\Exception\RequestException.php on line 51

So, I’m uninstalling this, very disappointed.