Migrating from Dovecot 1 to Dovecot 2

[Dovecot list]

Thanks for reply.
I try to make it, but @start i get this error.
mx3:/root/dsync@[23:11] # doveadm -v -c ahuryn.temp backup -R -u
test at test.pl imapc:
doveadm(test at test.pl): Error: Mail access for users with UID 145 not
permitted (see first_valid_uid in config file, uid from userdb lookup).
doveadm(test at test.pl): Error: User init failed

maildirectory is 145:145

Regards