How to Fix "192-SHA1(2)_160 pfsgroup=no-pfs"

This is a error related to openswan configuration. Once you have up and running ipsec, while trying to connect to sonicwall vpn you might get this error. Error: 002 "sonicwall" #2: initiating Quick Mode PSK+ENCRYPT+TUNNEL+UP+AGGRESSIVE+IKEv2ALLOW+SAREFTRACK