DBUA Does not Find parameter file to Start Database for Upgrade

While upgrading my database form using database upgrade assistant (DBUA), it showed me error that said following

The Upgrade Assistant failed in bringing up the database <db_name>. Oracle Home <ORACLE_HOME> obtained from file /etc/oratab was used to connect to the database. Either database is not running from Oracle Home <ORACLE_HOME> or correct initialization Parameter file (pfile) was not found. To start the database, Oracle needs the pfile. Provide the full path name of the init file for the database <db_name>

Screenshot of DBUA can be seen bellow

PING[ARC1]: Heartbeat failed to connect to standby 'my_standby'. Error is 12154

If your primary database is not able to ship archived logs to the standby database with error ORA-12154, there is something wrong with the TNS entry you are using in LOG_ARCHIVE_DEST_n parameter that points to your standby database. If you check the alert log file of the primary database you will see error messages similar to the following.