svn: Can't open file ' . --revision/format': No such file or directory

Hi ALL,

i am encountering the above error ie, svn: Can't open file ' . --revision/format': No such file or directory , when i try to backup my svn repo daily thru a script. The script is as follow:

#!/usr/bin/perl -w
#
# Perform a daily backup of a Subversion repository,
# using the previous most-recently-backed-up revision
# to create just an incremental dump.
#use strict;
#use warnings;
my $svn_repos = "/cvs/satrang/software";
my $backups_dir = "/home/svnbkp";
my $next_backup_file = "daily-incremental-backup." . `date +%Y%m%d`;
#print "*$next_backup_file*\n";
open(IN, "$backups_dir/last_backed_up");
$previous_youngest = <IN>;
chomp $previous_youngest;
close IN;
my $youngest = `svnlook youngest $svn_repos`;
chomp $youngest;
if($youngest eq $previous_youngest) {
print "No new revisions to back up.\n";
exit 0;
}
# We need to backup from the last backed up revision
# to the latest (youngest) revision in the repository
$first_rev = $previous_youngest + 1;
$last_rev = $youngest;
print "\n....Backing up revisions $first_rev to $last_rev...\n";
$svnadmin_cmd =`svnadmin dump --incremental " . "--revision $first_rev:$last_rev ". "$svn_repos > $backups_dir/$next_backup_file`;
`$svnadmin_cmd`;
print "\n...Compressing dump file...\n";
print `gzip -9 $backups_dir/$next_backup_file`;
open LOG, ">$backups_dir/last_backed_up";
print LOG $last_rev;
close LOG;

How to overcome this error?
Regards
Shann

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