Can't call method <function> on an undefined value at <module>

I want to reference a variable in a module that was created in the
module consuming program.

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The module looks like this:

#! /usr/bin/perl -w

package Module;
require Exporter;

our @ISA = qw(Exporter);
our @EXPORT = qw(f1);
our $VERSION = 1.00;

sub f1 {
print "$v1\n";
}

1;

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The consuming Perl script looks like this:

#! /usr/bin/perl -w

use Module;

$v1 = "v1";

f1();

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Any suggestions on how I make this work?

.