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="7DEC8AAC-37B1-11F1-A509-7F9BA9425785" uri="" key="login" method="post" encoding="&#x2713;">
    <field value="" name="username" key="username" display="Username" attrs="" widget="text" id="uuid-7DECBCDE-37B1-11F1-A509-7F9BA9425785"/>
    <field name="password" key="password" widget="password" attrs="" display="Password" id="uuid-7DED04E6-37B1-11F1-A509-7F9BA9425785"/>
    <field name="submit" value="" key="submit" widget="submit" attrs="" display="Login" id="uuid-7DED4F5A-37B1-11F1-A509-7F9BA9425785"/>
  </form>
</response>