Error when doing xtrabackup with prepare

Hi,

when executing:

/opt/percona-xtrabackup-2.4.21-Linux-x86_64.glibc2.12/bin/xtrabackup --defaults-file=… --prepare --user=root -p --target-dir=… -P 3308 -H 127.0.0.1

I am getting

xtrabackup: error: The transaction log file is corrupted.
xtrabackup: error: The log was not applied to the intended LSN!
xtrabackup: Log applied to lsn 0
xtrabackup: The intended lsn is 109000706572

even though backup completed successfully. Any ideas why?

can you show the full output taken during backup?
Obviously something went wrong, but it is hard to say what exactly by given information.