Hi, I am using the below code and i am getting error. How to solve this? i cannot understand this error also.

DBD::DBM::st execute failed:  Cannot open .\Reference.lck: No such fil
+e or directory at C:/Perl/lib/DBD/File.pm line 574.
 [for Statement "
     Select * from Reference"] at DataBaseControl.pl line 22.
DBD::DBM::st execute failed:  Cannot open .\Reference.lck: No such fil
+e or directory at C:/Perl/lib/DBD/File.pm line 574.
 [for Statement "
     Select * from Reference"] at DataBaseControl.pl line 22.
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use strict;
use warnings;
use DBI;
my ($dbh, $sth);
my $Error_Message = "\nThere Was A Problem Connecting To The Database\
+n";
my $driver = 'DBM';  # e.g., mysql or ODBC or ???
my $dbusername = 'sa';
my $dbpassword = 'admin';
my $server     = 'localhost';
my $database   = 'Copyediting';


$dbh = DBI->connect("dbi:$driver:$database:$server", $dbusername, $dbp
+assword,
                        {'RaiseError' => 1, 'PrintError' => 1}
                     ) ||  die "$Error_Message $DBI::errstr";

$dbh->{RaiseError} = 1;
 for my $sql( split /;\n+/,"
     Select * from Reference;
"){
     my $sth = $dbh->prepare($sql);
     $sth->execute;
     $sth->dump_results if $sth->{NUM_OF_FIELDS};
 }
 
$dbh->disconnect();
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Also i don't what driver needs to specify here? I have the below driver in my system using this code.
@driver_names = DBI->available_drivers;

DBM
ExampleP
File
ODBC
Proxy
SQLite
Sponge
mysql
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