I set the prefixes for the groups but even if i'm in them they don't work.
I'm using EssentialsChatX as chat manager.
Plugins List

If you're using EssentialsX (and EssentialsXChat) on a Spigot server, you don't need ChatManager. Having 2 chat management plugins will mess you up.

It's important to note, also, that "ChatManager" is not supported by PEX. The original "Chat Manager" plugin was discontinued and literally dozens of authors took that code, made their own "Chat Manager" plugin (keeping the name of the old plugin, but using their own coding changes over time) and it became too much of a pain in the ass to keep PEX compatible with all of them.

You're also using Multiverse, which has some prefix handling built in. So between the EssentialsX config.yml and the Multiverse config file(s), you'll have some stuff to setup to get the prefixes to display in-game the way that you like them.

On an unrelated side note, if the EssentialsKitManager plugin does something that Essentials does not do, keep it. Otherwise, it's just wasting space on your server because Essentials and EssentialsX have truly amazing kit management capabilities already. Likewise with the OpenInv plugin. Essentials and EssentialsX allow you to see into other players inventory.

The EssentialsX files you would want on a Spigot server are:

• EssentialsX-2.0.1.jar
• EssentialsXChat-2.0.1.jar

In Multiverse i set prefixchat to false
Multiverse-Core config: http://pastebin.com/8vixUkQx
EssentialsX Config: http://pastebin.com/9qJJzq0t

I removed ChatManager and reinstalled EssentialsXChat but it's the same

Did you edit/setup either of the config files I said needed to be setup?

Are you copying small parts of the file to Pastebin? (Why would you do that?)

My Essentials (not EssentialsX) config.yml is much, much, much longer than yours. And EssentialsX is based directly on Essentials, keeping the files very, very similar. You didn't even copy either of the chat sections, if you have the correct config file on your server.

See this example for snippets of the correct sections you should be editing in the EssentialsX config.yml file.

I don't use Multiverse, so you're on your own configuring that file.

It's working now, thank you

Excellent. :)

You're welcome.