XML Parser Error

I'm getting this error:

Undefined subroutine &XML::Simple::XMLin called at ./sample.pl line 3.

Here's my code and input file:

use XML::Simple;
use Data::Dumper;
$data = XMLin("sample.xml");
print Dumper($data);

<?xml version='1.0'?>
<employee>
 <name>John</name>
 <age>43</age>
 <gender>M</gender>
 <department>Operations</department>
</employee>

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