[imp] Error creating folders on Imp

[Rodrigo Monteiro]

Hello all,

I'm using Horde Groupware 1.0.3 + qmail + courier-imap

The problem is that Imp isn't creating the folders.

When I'm sending an e-mail, this message appears: "Message sent
successfully, but not saved to sent-mail"
Same when delete: "There was an error deleting messages from the
folder "Inbox". This is what the server said: [TRYCREATE] Mailbox does
not exist."
And save a draft: "Saving the draft failed. This is what the server
said: [TRYCREATE] Must create mailbox before append
Error  There was an error saving this message as a draft."

What could it be?

Regards,
Rodrigo.