DG broker error

Hello Gurus,

RHEL 7,Oracle 19.6

dg broker throwing below error even though the standby is in sync.

DGMGRL> show configuration;

Configuration - dgconfig

 Protection Mode: MaxPerformance

 Members:

 ope551c - Primary database

  Error: ORA-16724: cannot resolve gap for one or more members

  ope551cs - Physical standby database

Fast-Start Failover: Disabled

Configuration Status:

ERROR  (status updated 52 seconds ago)

SQL> SELECT ARCH.THREAD# "Thread", ARCH.SEQUENCE# "Last Sequence Received", APPL.SEQUENCE# "Last Sequence Applied", (ARCH.SEQUENCE# - APPL.SEQUENCE#) "Difference"

FROM

(SELECT THREAD# ,SEQUENCE# FROM V$ARCHIVED_LOG WHERE (THREAD#,FIRST_TIME ) IN (SELECT THREAD#,MAX(FIRST_TIME) FROM V$ARCHIVED_LOG GROUP BY THREAD#)) ARCH,