Faraday::SSLError: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B

I am using Linkedin OAuth API for rails and i am getting the following error when trying to get access code ...

access_token = $linkedin_oauth.get_access_token(code) Faraday::SSLError: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

Any idea what to do?