Cron Job is not executin

Hello, Below is the script for the RMAN backup, I have added this in the sh file. this script is working fine when executed manually, 

 Get the aliases and functions

if [ -f ~/.bashrc ]; then

        . ~/.bashrc

fi

rman target / msglog=/u01/IHCC/fra/rman_INCR_1_${ORACLE_SID}_${DATE}.log <<eof

CONFIGURE CONTROLFILE AUTOBACKUP ON;

CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/u01/IHCC/fra/autobackup_control_file%F';

CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 3 DAYS;

run {

ALLOCATE CHANNEL RMAN_BACK_CH01 TYPE DISK;

CROSSCHECK BACKUP;

BACKUP AS COMPRESSED BACKUPSET INCREMENTAL LEVEL 1 DATABASE FORMAT '/u01/IHCC/fra/databasefiles_%d_%u_%s_%T';