ERROR 1047 - WSREP has not yet prepared node for application use

When we use the insert statement "insert into xx select * from xx",the mariadb raise thie error “ERROR 1047 - WSREP has not yet prepared node for application use”,does our cluster happen splitting,but we check the parameter:
'wsrep_cluster_size=3',
'wsrep_connected=ON',
'wsrep_local_state_comment=Synced'
'wsrep_ready=on'
wsrep_incoming_addresses=192.168.xx,xx:3306,192.168.xx.xx:3306,192.168.xx.xx:3306'
these parameter shows status is ok.
So how do we solve this issue?Please give us a hand,Thanks.