Error: Unrecognized character \x01; marked by <-- HERE after...

Hi, I am trying innobackupex, and got error below. The error occurred at the beginning. The process did go the the end, with
170322 19:13:01 completed OK! Can I ignore the error?
Any information would be appreciated. Thank you in advance.


Unrecognized character \x01; marked by ← HERE after ← HERE near column 1 at - line 1374.
170322 19:12:31 Connecting to MySQL server host: localhost, user: choreer, password: set, port: not set, socket: not set
Using server version 5.7.17-0ubuntu0.16.04.1
innobackupex version 2.4.6 based on MySQL server 5.7.13 Linux (x86_64) (revision id: 8ec05b7)
xtrabackup: uses posix_fadvise().
xtrabackup: cd to /var/lib/mysql
xtrabackup: open files limit requested 0, set to 1024
xtrabackup: using the following InnoDB configuration:
xtrabackup: innodb_data_home_dir = .
xtrabackup: innodb_data_file_path = ibdata1:12M:autoextend
xtrabackup: innodb_log_group_home_dir = ./
xtrabackup: innodb_log_files_in_group = 2
xtrabackup: innodb_log_file_size = 50331648
InnoDB: Number of pools: 1
170322 19:12:31 >> log scanned up to (7186164)
xtrabackup: Generating a list of tablespaces
InnoDB: Allocated tablespace ID 21 for sys/sys_config, old maximum was 0
170322 19:12:32 [01] Copying ./ibdata1 to /aceletBackup/mysqlBackup/db/ibdata1
170322 19:12:32 >> log scanned up to (7186164)
170322 19:12:33 >> log scanned up to (7186164)
170322 19:12:34 [01] …done

170322 19:12:51 [00] Writing xtrabackup_info
170322 19:12:51 [00] …done
xtrabackup: Transaction log of lsn (7186155) to (7186164) was copied.
170322 19:12:51 completed OK!