problem with chat manager

[Minecraft_Nick]

i have a 3.1.1 server and i installed 1.2.5 R4 pex and the other two plugins that come with pex (modify world and chat manager) Pex and modify world installed no problem but chat manager wont work and this plugin is essentials to good perms. i also tried essentials chat that doesn't work, so idk what to do if anyone could leave an alternative plugin i could use or a solution that would be awesome....thanks in advance