pg_dump: aborting because of server version mismatch

Hi,
I am trying to create a daily backup cron script but it fails with an error
as below:

Any pointers to resolve this will be greatly appreciated.

Thanks,
Mitesh Shah
mitesh(dot)shah(at)stripes39(dot)com

*(1) Error:*
bash-3.2$ sh pg_backup_rotated_orig.sh
Making backup directory in /Users/miteshshah/Documents/2012-05-02-daily/
-e

Performing full backups
-e --------------------------------------------

Plain backup of mitesh
*pg_dump: server version: 9.1.2; pg_dump version: 9.0.5*
*pg_dump: aborting because of server version mismatch*
-e
All database backups complete!

*(2.1) * /Users/miteshshah/Desktop/*pg_backup.config file:*
#############################
## POSTGRESQL BACKUP CONFIG ##
##############################
# hostname to adhere to pg_hba policies.
HOSTNAME= <host>

# username to connect to database as.
USERNAME=<user>

# Database name
DATABASE=<database>

# This dir will be created if it doesn't exist. This must be writable by
the user the script is
# running as.
BACKUP_DIR=<backup_dir>

# SCRIPTPATH
SCRIPTPATH=<path>

# Will produce a custom-format backup if set to "yes"
ENABLE_CUSTOM_BACKUPS=yes

# Will produce a gzipped plain-format backup if set to "yes"
ENABLE_PLAIN_BACKUPS=yes

#### SETTINGS FOR ROTATED BACKUPS ####

# Which day to take the weekly backup from (1-7 = Monday-Sunday)
DAY_OF_WEEK_TO_KEEP=5

# Number of days to keep daily backups
DAYS_TO_KEEP=7

# How many weeks to keep weekly backups
WEEKS_TO_KEEP=5

######################################

*(2.2) * /Users/miteshshah/Desktop/*pg_backup_rotated_orig.sh*
#!/bin/bash

###########################
####### LOAD CONFIG #######
###########################

source /Users/miteshshah/Desktop/pg_backup.config

###########################
#### START THE BACKUPS ####
###########################

function perform_backups()
{
SUFFIX=$1
FINAL_BACKUP_DIR=$BACKUP_DIR"`date +\%Y-\%m-\%d`$SUFFIX/"

echo "Making backup directory in $FINAL_BACKUP_DIR"

if ! mkdir -p $FINAL_BACKUP_DIR; then
echo "Cannot create backup directory in $FINAL_BACKUP_DIR.
Go and fix it!"
exit 1;
fi;

###########################
###### FULL BACKUPS #######
###########################

echo -e "\n\nPerforming full backups"
echo -e "--------------------------------------------\n"

if [ $ENABLE_PLAIN_BACKUPS = "yes" ]
then
echo "Plain backup of $DATABASE"

if ! pg_dump -Fp -h "$HOSTNAME" -U "$USERNAME"
"$DATABASE" | gzip > $FINAL_BACKUP_DIR"$DATABASE".sql.gz.in_progress; then
echo "[!!ERROR!!] Failed to produce plain
backup database $DATABASE"
else
mv
$FINAL_BACKUP_DIR"$DATABASE".sql.gz.in_progress
$FINAL_BACKUP_DIR"$DATABASE".sql.gz
fi
fi

if [ $ENABLE_CUSTOM_BACKUPS = "yes" ]
then
echo "Custom backup of $DATABASE"

if ! pg_dump -Fc -h "$HOSTNAME" -U "$USERNAME"
"$DATABASE" -f $FINAL_BACKUP_DIR"$DATABASE".custom.in_progress; then
echo "[!!ERROR!!] Failed to produce custom
backup database $DATABASE"
else
mv
$FINAL_BACKUP_DIR"$DATABASE".custom.in_progress
$FINAL_BACKUP_DIR"$DATABASE".custom
fi
fi

echo -e "\nAll database backups complete!"
}

# DAILY BACKUPS

# Delete daily backups 7 days old or more
find $BACKUP_DIR -maxdepth 1 -mtime +$DAYS_TO_KEEP -name "*-daily" -exec rm
-rf '{}' ';'