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 encoding="&#x2713;" key="login" method="post" uri="" uuid="4C2C9D38-D16A-11F1-B34B-9ED149691810">
    <field attrs="" widget="text" name="username" extra="" value="" id="uuid-4C2CCEA2-D16A-11F1-B34B-9ED149691810" key="username" display="Username"/>
    <field name="password" display="Password" extra="" attrs="" id="uuid-4C2D14AC-D16A-11F1-B34B-9ED149691810" key="password" widget="password"/>
    <field extra="" id="uuid-4C2D5E12-D16A-11F1-B34B-9ED149691810" value="" key="submit" display="Login" attrs="" widget="submit" name="submit"/>
  </form>
</response>