sync_soledad_error:L#238 - WARNING - Unknown error while syncing soledad: Unauthorized()

I can send email fine.

I am using the latest .3.8 client on linux x64.

2013-12-14 12:26:45,448 - leap.mail.imap.fetch:fetch:L#153 - DEBUG - fetching mail for: cdebbede177ba1dd4ecbcf8a16d7a5b0 sunbird@bitmask.net
2013-12-14 12:26:45,450 - leap:write:L#53 - DEBUG - 2013-12-14 12:26:45-0800 [-] syncing soledad...
2013-12-14 12:26:45,796 - leap.mail.imap.fetch:_sync_soledad_error:L#232 - ERROR - error syncing soledad: 
2013-12-14 12:26:45,797 - leap.mail.imap.fetch:_sync_soledad_error:L#238 - WARNING - Unknown error while syncing soledad: Unauthorized()
2013-12-14 12:26:45,797 - leap:write:L#53 - DEBUG - 2013-12-14 12:26:45-0800 [-] processing doclist
2013-12-14 12:26:45,798 - leap.mail.imap.fetch:_process_doclist:L#277 - DEBUG - no docs found

I'm not sure why I am "unauthorized."

(from redmine: created on 2013-12-14, closed on 2014-03-19, relates #4783 (closed))