Board Thread:LotR Mod Technical Support/@comment-26946666-20160108183443/@comment-26172435-20160108210320

Which Forge version are you using? Try Forge 10.13.2.1291, that is certain to be fit for the job. More recent versions may also work, but development versions can give incompatibility issues and result in the situation you experienced.

Note that TOS is also using that Forge version, if I'm informed correctly. The version mentioned on their server page contained a wrong number. Corrected that.