I put forge on yesterday for the first time moding and got the same crash report. 
I did some searching last night and a few suggestions were to reboot (worked for the dude but not me); 
Shut of your Firewall (lame lame suggestion...but worked for one dude and not another...who then got creamed with malware...so I did NOT try that).  However my advast had been pinging me for about a week saying a new version was available.  So I did that next and after a few reboots, we were able to load worlds with forge.   So maybe there is some java/firewall issue here.   I'd still call this a bug with forge if it requires adjusting java or your firewall.