I'm sorry but I don't uderstand what you mean (probably due to a wrong translation). Do you have a sample?
EDIT:
If errors you talk about are that folders mentionned in the cron mail are not shown in the maillist, it's not an error, this mail just indicates that imap tree is regenerated each hours.
Maildir is the root of the user IMAP box corresponding to INBOX
folders like .demo.test.sub2 are user folders in imap box
cur, tmp, courierimapacl,maildirfolder,courierimapkeywords,new,courierimapuiddb are here for the server to administrate the imap folder.