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" key="login" encoding="&#x2713;" uuid="C0AE097A-CC7F-11F1-97AD-585D2C684F3D" uri="">
    <field name="username" id="uuid-C0AE3F94-CC7F-11F1-97AD-585D2C684F3D" key="username" value="" attrs="" display="Username" widget="text"/>
    <field widget="password" name="password" id="uuid-C0AE87EC-CC7F-11F1-97AD-585D2C684F3D" key="password" attrs="" display="Password"/>
    <field widget="submit" value="" attrs="" name="submit" id="uuid-C0AED3A0-CC7F-11F1-97AD-585D2C684F3D" key="submit" display="Login"/>
  </form>
</response>