Mutt + offlineimap can't receive Gmail??

[zhugehonghn <zhugehonghn@xxxxxxxxx>]

I set mutt+offlineimap receive my Gmail
my .offlineimaprc is:
/[general]
ui = Blinkenlights
accounts = GMail

[Account GMail]
localrepository = Gmail-Local
remoterepository = Gmail-Remote

[Repository Gmail-Local]
type = Maildir
localfolders = ~/Mails/Gmail

[Repository Gmail-Remote]
type = Gmail
keepalive = 30
realdelete = yes
holdconnectionopen = yes
remoteuser = zhugehonghn@xxxxxxxxx
remotepass = NEWKMMLJM8UMJ7M
cert_fingerprint=f3043dd689a2e7dddfbef82703a6c65ea9b634c1
#"[Gmail]/Some Folder" --> some_folder
nametrans = lambda folder: re.sub('^inbox$', 'INBOX',
                         re.sub(' +', '_',
                         re.sub(r'.*/(.*)$', r'\1', folder).lower()))/

i can receive mail at first time,but it didn't work when i use 
"offlineimap -o" receive again
and error output:
/Folder 'drafts'[GMAIL-Remote] could not be created. Server responded: 
('NO', ['[ALREADYEXISTS] Folder name conflicts with existing folder 
name. (Failure)'])/
how can i solve it???