If you see the following error while running the Calendar with Google integration application, try the following steps:
Fatal error: Uncaught GuzzleHttp\Exception\RequestException: cURL error 60: SSL certificate problem: unable to get local issuer certificate
Download the file on this link: http://curl.haxx.se/ca/cacert.pem
The file cacert.pem will be downloaded, rename this file to curl-ca-bundle.crt
Put the file in: .. \NetMake\v9\components\php\extras\
Edit the php.ini file, located in ..\NetMake\v9\components\php\
Change the contents of the line:
; curl.cainfo = ""
curl.cainfo = "full_path\NetMake\v9\components\php\extras\curl-ca-bundle.crt"
curl.cainfo = "C:\PROGRA~1\NetMake\v9\components\php\extras\curl-ca-bundle.crt"
After that, restart the apache service and run the Calendar application again.