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="" encoding="&#x2713;" key="login" uuid="57D85572-4BB5-11F1-9A67-B0641BBD9EFC">
    <field key="username" attrs="" name="username" value="" widget="text" id="uuid-57D8848E-4BB5-11F1-9A67-B0641BBD9EFC" display="Username"/>
    <field name="password" attrs="" key="password" display="Password" id="uuid-57D8C9C6-4BB5-11F1-9A67-B0641BBD9EFC" widget="password"/>
    <field display="Login" id="uuid-57D91250-4BB5-11F1-9A67-B0641BBD9EFC" widget="submit" value="" name="submit" attrs="" key="submit"/>
  </form>
</response>