[Dovecot] Error with 1.1 Beta

I am running the latest version of the 1.1 beta and just got the following error:

Jan 17 06:20:13 apple dovecot: IMAP(jeff): rename(/home/jeff/Maildir/.Sent Items/dovecot.index.cache.lock, /home/jeff/Maildir/.Sent Items/dovecot.index.cache) failed: No such file or directory Jan 17 06:20:13 apple dovecot: IMAP(jeff): file_dotlock_replace() failed with index cache file /home/jeff/Maildir/.Sent Items/dovecot.index.cache: No such file or directory

Is it something I should be concerned about? I had just sent an e-mail about 30 seconds before that one which did not give the error. I will see if I get the error again when I send this one.

Jeff