Oracle Forms || Ora-12514 : TNS listener doesnt know of the current descriptor || 12.2.1.3.0

Hello Everyone,

I Am receiving Ora-12514 TNS Listener does not currently know of the service requested in the connect descriptor Message.

When we try to connect to Oracle forms

http://hostname:9005/Forms/frmservlet?config=myconfig.

This is the tnsentry in my tnsnames.ora file.

Location : <Domain_HOME/>config/FMWConfig/

DBINSTANCE =

 (DESCRIPTION =

  (ADDRESS_LIST =

   (ADDRESS = (PROTOCOL = TCP)(HOST = PrimaryDB)(PORT = 1521))

   (ADDRESS = (PROTOCOL = TCP)(HOST = SecondaryDB)(PORT = 1521))

  )

  (CONNECT_DATA =

   (SID = DBinstanceprd_pm.world)

  )

 )

**Key Points :

1) I was able to connect to DB instance from SQL plus without issues

Cmd Prompt : Oracle_home\bin\sqlplus

sqlplus dbuser/dbpasswore@dbinstance

Result : connected succesfully

2) no issues connecting from forms builder