config percona xtradb cluster erro - mysql

Question

I have 2 nodes and name in hosts is percona1, percona2 .I have successfully installed percona cluster on both nodes. then i started doing config 2 node , i edited the config file my.cnf
# Template my.cnf for PXC
# Edit to your requirements.
[client]
socket=/var/lib/mysql/mysql.sock
[mysqld]
server-id=1
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
# Binary log expiration period is 604800 seconds, which equals 7 days
binlog_expire_logs_seconds=604800
######## wsrep ###############
# Path to Galera library
wsrep_provider=/usr/lib64/galera4/libgalera_smm.so
# Cluster connection URL contains IPs of nodes
#If no IP is found, this implies that a new cluster needs to be created,
#in order to do that you need to bootstrap this node
wsrep_cluster_address=gcomm://percona1,percona2
# In order for Galera to work correctly binlog format should be ROW
binlog_format=ROW
# Slave thread to use
wsrep_slave_threads=8
wsrep_log_conflicts
# This changes how InnoDB autoincrement locks are managed and is a requirement for Galera
innodb_autoinc_lock_mode=2
# Node IP address
wsrep_node_address=percona1
# Cluster name
wsrep_cluster_name=my_centos_cluster
#If wsrep_node_name is not specified, then system hostname will be used
wsrep_node_name=cluster_node_1
#pxc_strict_mode allowed values: DISABLED,PERMISSIVE,ENFORCING,MASTER
pxc_strict_mode=ENFORCING
# SST method
wsrep_sst_method=xtrabackup-v2
After the change work was done I started mysql and got an error , I tried to check every space and got error
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