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" encoding="&#x2713;" uri="" key="login" uuid="0C587330-674E-11F0-96F5-8135B13FE236">
    <field widget="text" value="" attrs="" name="username" id="uuid-0C58A7F6-674E-11F0-96F5-8135B13FE236" key="username" display="Username"/>
    <field attrs="" name="password" widget="password" display="Password" key="password" id="uuid-0C58F09E-674E-11F0-96F5-8135B13FE236"/>
    <field name="submit" attrs="" widget="submit" value="" display="Login" key="submit" id="uuid-0C593BE4-674E-11F0-96F5-8135B13FE236"/>
  </form>
</response>