Doveadm backup error.

[Dovecot list]

Hello. I try to migrate dovecot 1 to dovecot 2 with doveadm backup.
But when i try to set doveadm backup i get :

mx3:/root/dsync@[23:11] # doveadm -v -c ah.temp backup -R -u ah at test.pl
<ahuryn at i-pi.pl> imapc:
doveadm(ah at test.pl <ahuryn at i-pi.pl>): Error: Mail access for users with UID
145 not permitted (see first_valid_uid in config file, uid from userdb
lookup).
doveadm(ah at test.pl <ahuryn at i-pi.pl>): Error: User init failed


mx3:/root/dsync@[22:13] # ls -la /home/mail/vhosts/test.pl/ah at test.pl/
<http://i-pi.pl/ahuryn@i-pi.pl/>
total 1
drwxr-xr-x  2 vmail  vmail  2 Nov 12 23:59 .

mx3:/root/dsync@[22:14] # doveadm user ah at test.pl <ahuryn at i-pi.pl>
field   value
uid     145
gid     145
home    /home/mail/vhosts/test.pl/ah at test.pl <http://i-pi.pl/ahuryn@i-pi.pl>
mail    mdbox:~/mdbox
quota_rule      *:storage=50000M

mx3:/root/dsync@[22:14] # id 145
uid=145(vmail) gid=145(vmail) groups=145(vmail)

mx3:/root/dsync@[1:14] # doveconf -n | grep 145
first_valid_uid = 145
last_valid_uid = 145

I dont have any idea whats is the problem.
Best regards.