Error while accessing https site

Hi
I am getting below error while accessing https site.
used below code still error persist
FirefoxProfile profile=new FirefoxProfile();
profile.setAcceptUntrustedCertificates(true);




Exception in thread "main" org.openqa.selenium.WebDriverException: Reached error page: about:certerror?e=nssBadCert&u=https%3A//www.makemytrip.com/&c=UTF-
8&f=regular&d=www.makemytrip.com%20uses%20an%20invalid%20security%20certificate.%0A%0A
The%20certificate%20is%20not%20trusted%20because%20the%20issuer%20certificate%20is%20un
known.%0AThe%20server%20might%20not%20be%20sending%20the%20appropriate%20intermedia
te%20certificates.%0AAn%20additional%20root%20certificate%20may%20need%20to%20be%20imp
orted.%0A%0AError%20code%3A%20%3Ca%20id%3D%22errorCode%22%20title%3D%22SEC_ERR
OR_UNKNOWN_ISSUER%22%3ESEC_ERROR_UNKNOWN_ISSUER%3C/a%3E%0A
Build info: version: 'unknown', revision: '1969d75', time: '2016-10-18 09:43:45 -0700'
System info: host: 'PHXC02J05430605', ip: '10.91.63.51', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_111'
Driver info: org.openqa.selenium.firefox.FirefoxDriver


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I ha