How to fix error message from data guard broker "Property 'DbFileNameConvert' has inconsistent values"

After a rebuild of a physical standby database, I was tailing the broker log file drcSALES.log, and noticed the following warning:

Property 'DbFileNameConvert' has inconsistent values:
METADATA='/data1/oradata/SALES, /data1_tstb/oradata/SALES, /data2/oradata/SALES, /data2_tstb/oradata/SALES', 
SPFILE=  '/data1/oradata/SALES, /data1_tstb/oradata/SALES, /data2/oradata/SALES, /data2_tstb/oradata/SALES', 
DATABASE='/data1/oradata/SALES/, /data1_tstb/oradata/SALES/, /data2/oradata/SALES/, /data2_tstb/oradata/SALES/'

Note that the metadata and spfile is missing the trailing slash character /.

To fix this incorrect setup:

dgmgrl / as sysdba
show configuration;
Configuration - SALES

  Protection Mode: MaxPerformance
  Members:
  SALES      - Primary database
    SALES_STB  - Physical standby database
      SALES_TSTB - Physical standby database (receiving current redo)
    SALES_RO   - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS   (status updated 20 seconds ago)

Check the current setting:

show database 'SALES_TSTB' DbFileNameConvert
DbFileNameConvert = '/data1/oradata/SALES, /data1_tstb/oradata/SALES, /data2/oradata/SALES, /data2_tstb/oradata/SALES'

Update the property:

DGMGRL> edit database 'SALES_STB' set property DbFileNameConvert='/data1/oradata/SALES/,/data1_stb/oradata/SALES/, /data2/oradata/SALES/, /data2_stb/oradata/SALES/';
Warning: ORA-16675: database instance restart required for property value modification to take effect

Property "dbfilenameconvert" updated

Verify the new setting:

show database 'SALES_TSTB' DbFileNameConvert
DbFileNameConvert = '/data1/oradata/SALES/, /data1_tstb/oradata/SALES/, /data2/oradata/SALES/, /data2_tstb/oradata/SALES/'

Restart your physical database, and the issue is fixed.