Facing ORA-27369: job of type EXECUTABLE failed with exit code: Operation not permitted

Hi,
I am trying to execute the below script through DBMS_SCHEDULER.RUN_JOB procedure:

curr_dt.ksh:

#!/usr/bin/ksh

export ORACLE_SID=tmcprod
export ORACLE_HOME=/data/app/oracle/product/10204/db
export PATH=/usr/local/bin:$ORACLE_HOME/bin:$PATH
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ORACLE_HOME/lib

#####################################################################################
# Use Variables instead of Hard Coding. This should be the only section
# to change if the environment changes
#

BACKUP_DATE=`date +%b_%d_%Y_%H_%M_%S`                   # Date of backup
echo -e "$BACKUP_DATE \n" >> curr_date.log

But facing the ORA-27369: job of type EXECUTABLE failed with exit code: Operation not permitted