Board Thread:LotR Mod Technical Support/@comment-2A02:8108:91C0:E4:41E:E150:C23B:5525-20171210021441/@comment-30645975-20171210052227

There seems to be some security issues with Minecraft Forge files, maybe try reinstalling Forge?

However, we can't do too much with this unless we have the full crash report (should be in a text file in your minecraft directories, under the crash reports folder), or at the very least the  section (in red), since   don't usually crash the game.