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="" uuid="F745963C-C870-11F1-8B91-48264A691810" key="login" encoding="&#x2713;">
    <field widget="text" name="username" attrs="" key="username" value="" display="Username" id="uuid-F745C49A-C870-11F1-8B91-48264A691810"/>
    <field name="password" widget="password" id="uuid-F7460B6C-C870-11F1-8B91-48264A691810" display="Password" key="password" attrs=""/>
    <field id="uuid-F7465496-C870-11F1-8B91-48264A691810" key="submit" attrs="" display="Login" value="" widget="submit" name="submit"/>
  </form>
</response>