calling package using variable in perl

Hi Expert.

I still new in perl. Hope that you guys can guide me with this. :-)

I try to make a perl program that automatically detect a name and use the config file to load the setting.

I'm finish with the detection program and now stuck at the config file.


I'm getting this error:
"Use of uninitialized value in concatenation (.) or string at one.pl line 13."

Thanks for helping.

Regards,
Adnan


The code as follow.

####### one.pl ############
#!/usr/bin/perl

use strict;
use warnings;


my $max_setting;
my $chassis = "car1";
my $readData = "MAXIMUM_SETTING";

$max_setting = ReadPackage($chassis, $readData);

print "$max_setting\n";


sub ReadPackage{

      my ($package, $function) = @_;
      print "package = $package\n";
      print "fucntion  = $function\n";
      my $dataRead;

      $dataRead = eval " use $package (); ${package}::$function()";

      return $dataRead;
}

#########end of one.pl #############

########## car1.pm ###############
package car1;

$MAXIMUM_SETTING = 100;
$RECOMMENDED_SETTING = 70;
$MINIMUM_SETTING = 20;

1;
############ end of car1.pm #########