use innobackupex to backup a specific database

I want to create a slave to sync a specific database which is used to read. So i use innobackupex to backup the database and use it to init my slave.
i use the command innobackupex --user=xxx --password=xxx --databases=rpt_version /mnt/bak and completed ok. However when i in apply-log stage,it come to some error but it also print completed ok at the last.
The apply command is innobackupex --user=xxx --password=xxx --databases=rpt_version --apply-log /mnt/bak.
The output of xtrabackup --print-defatlts is

and the output of apply-log stage :