2868931 - preupgrade.jar fails with "ERROR - Unable to run preupgrade" and PLS-00302

Running preupgrade.jar while upgrading the Oracle Database to 18c or above below error is visible in the command prompt:

oracle> $ORACLE_HOME/jdk/bin/java -jar /oracle/<DBSID>/18.0.0/sap/ora_upgrade/pre_upgrade_utility/preupgrade.jar FILE DIR /oracle/<DBSID>/oraupgrade.18c
ERROR - Unable to run the preupgrade due to:ERROR - Unable to run preupgrade due to:
old  10:     is_xml := ('&&2' = 'XML');
new  10:     is_xml := ('TEXT' = 'XML');
old  12:     IF '&&1' = 'FILE' THEN
new  12:     IF 'FILE' = 'FILE' THEN
old  38:     IF '&&3' = 'EXEC' THEN
new  38:     IF 'EXEC' = 'EXEC' THEN
    dbms_preup.debug := false;
               *
ERROR at line 8:
ORA-06550: line 8, column 16:
PLS-00302: component 'DEBUG' must be declared
ORA-06550: line 8, column 5:
PL/SQL: Statement ignored
ORA-06550: line 18, column 23:
PLS-00302: component 'DB_IS_CDB' must be declared
ORA-06550: line 18, column 9:
PL/SQL: Statement ignored
ORA-06550: line 39, column 45:
PLS-00302: component 'RUN_PREUPGRADE' must be declared
ORA-06550: line 39, column 9:
PL/SQL: Statement ignored
ORA-06550: line 48, column 20:
PLS-00302: component 'DB_IS_CDB' must be declared
ORA-06550: line 48, column 6:
PL/SQL: Statement ignored

• Oracle RDBMS 12c or above
• SAP Netweaver

preupgrade.jar, upgrade, dbua.sap.sh, DBUA, invalid, status, objects, dba_registry, dba_objects, 18c, 12c, 12.2.0.1, 19c, 12.1.0.2, PLS-00302, ORA-06550 , KBA , BC-DB-ORA , Oracle , Problem