Can someone tell me what I'm doing wrong?

#!/usr/bin/perl -w

use Cache::MemoryCache;

my $cache = new Cache::MemoryCache();
my $customer = $cache->get($ARGV[0]);

if( not defined $customer ){
    print "setting cache\n";
    $customer->{'email_address'} = 'foo@foo.com';
    $customer->{'first_name'} = 'foo';
    $customer->{'last_name'} = 'bar';
    $customer->{'id'} = $ARGV[0];
    $cache->set($ARGV[0], $customer, "10 minutes" );
}
[download]

For some reason I can get the FileCache to work but not the memory Cache. This works just fine in the "Default" Namespace

#!/usr/bin/perl -w

use Cache::FileCache;

my $cache = new Cache::FileCache();
my $customer = $cache->get($ARGV[0]);

if( not defined $customer ){
    print "setting cache\n";
    $customer->{'email_address'} = 'foo@foo.com';
    $customer->{'first_name'} = 'foo';
    $customer->{'last_name'} = 'bar';
    $customer->{'id'} = $ARGV[0];
    $cache->set($ARGV[0], $customer, "10 minutes" );
}
[download]

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