I'm not sure if this is a problem you're experiencing on RMS, or your own server... but anyway, the problem should be what FusionNeko mentioned. The newest client uses a different skill tree table and job inherit list. If you don't know how to add the updated skilltreeview.txt and jobinheritlist.txt into your data file/folder, and don't want to learn how, then I suggest you get an earlier client, such as the 2008-10-29 or 2008-11-12a clients. These clients support the new skill tree, but they don't require the updated files to be added.