Problem in doveadm import dovecot 2.2

Dear, I always used dovecot in version 2.0 and in the last month i update my servers to dovecot 2.2 but now i have problems with comand dovecot import, not works for me, bellow i put 2 examples used in my tests in boths cases not works for me.

Someone already saw some case similar or can help me with this ?

doveadm import -u teste@aaaaa.com mdbox:~/mdbox-backup "" mailbox INBOX from testeteste@bbbb.com

doveadm import -u teste@xxx.com mdbox:/var/backup/teste@aaaaa.com/ "" all

Thanks a Lot Alexander