I wrote this small perl code to count the visitors in my web page, I have placed it in Apache directory`s cgi-bin folder, but everything (SSI commands, XTML) is working except the perl part, it doesn`t even show up, for perl section "an error occured while processing this directive" appears, could you check the below code and tell me where I went wrong?

#!/usr/bin/perl
# Program to track the number of times
# a Web page has been accessed.

use CGI qw( :standard );

open( COUNTREAD, "counter.dat" );
$data = <COUNTREAD>;
$data++;
close( COUNTREAD );

open( COUNTWRITE, ">counter.dat" );
print( COUNTWRITE $data );
close( COUNTWRITE );

print( header(), "<div style = \"text-align: center;
                                font-weight: bold\">" );
print( "You are visitor number", br() );

for ( $count = 0; $count < length( $data ); $count++ ) {
   $number = substr( $data, $count, 1 );
   print( { $number }, "\n" );
}
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I appreciate it...