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 uuid="F04F9066-C777-11F1-802F-99D049691810" key="login" encoding="&#x2713;" method="post" uri="">
    <field name="username" widget="text" display="Username" value="" key="username" attrs="" id="uuid-F04FC2E8-C777-11F1-802F-99D049691810"/>
    <field id="uuid-F0500956-C777-11F1-802F-99D049691810" display="Password" attrs="" key="password" name="password" widget="password"/>
    <field id="uuid-F050533E-C777-11F1-802F-99D049691810" display="Login" value="" attrs="" key="submit" name="submit" widget="submit"/>
  </form>
</response>