XSLT Error

Empty filename at /home/ubuntu/perl5/perlbrew/perls/perl-5.18.0/lib/site_perl/5.18.0/Chameleon5/Template/XSLT.pm line 575.

Response XML

<?xml version="1.0"?>
<response>
  <form method="post" uri="" key="login" encoding="&#x2713;" uuid="E4C1BCA6-4CD9-11F1-B79A-833E1BBD9EFC">
    <field widget="text" id="uuid-E4C1EFB4-4CD9-11F1-B79A-833E1BBD9EFC" display="Username" attrs="" key="username" name="username" value=""/>
    <field attrs="" key="password" name="password" widget="password" display="Password" id="uuid-E4C23758-4CD9-11F1-B79A-833E1BBD9EFC"/>
    <field value="" name="submit" key="submit" attrs="" display="Login" id="uuid-E4C280C8-4CD9-11F1-B79A-833E1BBD9EFC" widget="submit"/>
  </form>
</response>