Backup of Apex

Hi Experts,

We are using Apex version 22.1

Database version 19c - CDB with single PDB

2 node RAC

PRODDB is PDB

prodcdb is CDB

We are trying to take backup of apex using below command,but fails.

[oraprod@proddb1 19cdbhome]$ cd /u02/EMbook/apex/utilities

[oraprod@proddb1 utilities]$ export JAVA_HOME=$ORACLE_HOME/jdk

[oraprod@proddb1 utilities]$ export PATH=$ORACLE_HOME/jdk/bin:$PATH

[oraprod@proddb1 utilities]$ export CLASSPATH=.:$ORACLE_HOME/jdbc/lib/ojdbc6.jar:$ORACLE_HOME/apex/utilities/oracle/apex:$ORACLE_HOME/oui/jlib/classes12.jar

[oraprod@proddb1 19cdbhome]$ echo $ORACLE_SID

prodcdb1

[oraprod@proddb1 19cdbhome]$ which java

/usr/bin/java