What do the errors say?
Maybe you have something already installed that interferes with chatbar, so knowing what other addon's you've got installed would help too.
You moved the extracted folder named ChatBar into the AddOns folder, correct?
You need to extract the zipped folder before it'll work and you've gotta keep those loose files in the addon's main folder.
You very likely already know all that stuff. I would say try clearing the cache (deleting the WDB folder) but I don't think that's really involved. I'm afraid I don't know very much about what goes on under the hood.
We may need to contact an AddOn guru.
I'm sure we can figure this out for you though.