I got mbox store provide from dog.net.uk (knife). I am trying to use populate demo program that comes part of the JAVAMAIL API to populate a folder from my IMAP provider to mbox (file based) provider. What are the arguments for this (especially for the destination URL)? Thanks in advance

I used this syntax

java populate -s imap://user:password@imaphost.com/folder -d mbox://localuser:localpassword@localsystem.com/ /folder -f

I get the error
Populating /folder
couldn't create /folder