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 key="login" uri="" encoding="&#x2713;" uuid="AFDB88D0-8426-11F1-988E-65B82C3515A0" method="post">
    <field widget="text" name="username" display="Username" value="" attrs="" key="username" id="uuid-AFDBBC7E-8426-11F1-988E-65B82C3515A0"/>
    <field widget="password" name="password" display="Password" attrs="" key="password" id="uuid-AFDC0328-8426-11F1-988E-65B82C3515A0"/>
    <field name="submit" attrs="" display="Login" value="" key="submit" widget="submit" id="uuid-AFDC4CF2-8426-11F1-988E-65B82C3515A0"/>
  </form>
</response>