Prefix Tag. Not showing up in color.

When I go and make a prefix for my rank it does not show up as the colors. It shows up as regular gray text.
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That's what I did. As you can see it just showed up as Owner .
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I'm confused on what to do next. I just don't know where to start. . My config files will be posted in the next post. Any help with this would be awesome!
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Regards,
CyborgR

groups.yml
http://pastebin.com/m6UtCfNg

ERROR.LOG
http://pastebin.com/FgiNtg6c

config.yml for GroupManger
http://pastebin.com/LLgJCdHx

Global Groups. yml
http://pastebin.com/QEckuRCa

EDIT by Timtower: merged posts

 

Not sure about group manager, but on PEX you need to put in quotations.

Try this? /command prefix add "[prefix]"
Hope it works.

 

@CyborgR There is a problem with the groups file.