Cannot prepare backup with innobackupex

I taken full backup from a Master server with innobackupex. Now I am restoring backup with innobackupex on a Slave server. I prepare backup with the command:

innobackupex --defaults-file=/var/lib/mysql/backup-my.cnf --apply-log /var/lib/mysql

This command end up with messages:

xtrabackup: cd to /var/lib/mysql/
xtrabackup: This target seems to be not prepared yet.
xtrabackup: No valid checkpoint found.
xtrabackup: Error: xtrabackup_init_temp_log() failed.

What do I need to do to get rid of these messages and restore my backup? I use innobackupex version 2.3.10 and percona server 5.7.35. I have seen [this](https://dba.stackexchange.com/questions/42855/percona-xtrabackup-prepare-fails) question, but its answer did not help me.