You have modifyworld jar right?
Oh umm thats weird. HeroChat also requires Vault, so make sure you have that and then try a restart.
Maybe HeroChat, or EssentailsChat, or ChatManger with PEX,
You won't get help with that here. Check the Forge website. It will probably be remove for my post, but here to get you started...
Well wait a minute LWC as a beta build for 1.5. It should work. http://dev.bukkit.org/server-mods/lwc/files/35-lwc-4-3-2-beta-3/
The only issue...
Separate names with a comma.