[Dovecot] after upgrade to 2.x, sieve do not create folder

after upgrade to 2.x, sieve do not create folder, which do not exist. i remenber(maybe wrong) 1.2.x sieve plugin will create folder, if it do not exist.

the sieve log like this failed to store into mailbox 'dovecot': Mailbox doesn't exist: dovecot

can i config sieve automatic create the folder?

please help, and thank you.