Hmmm. Its hard for me to tell exactly what's happening, sorry. But what I would do is reinstall GroupManager entirely, and try doing it all in-game. In-game wont allow any errors because it does everything for you. If you use PEX... then get GroupManager. =P
WhoThatSword You were missing single quotes on Owner's suffix, and you also had many unneeded spaces. Try this: http://pastebin.com/DHZcmQf7