EmClient Can't Create Folders, and restart Empty

Edit Subject

I have a problem, I am in DreamHost, and the emClient works nice, it's the better email client I have had, but it give me continuous errors like this:

thanks@youtouniverse.com: An error ocurred
[IMAP] Unable to create folder "thanks@youtouniverse.com/Trash/" on the server
(Unknown namespace.)

An when I restart emClient all folders are empty...

Please help me I don't want to use Thunderbird, I want emClient!

Thanks to all :)