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 uri="" key="login" method="post" uuid="8A71238E-3C82-11F1-AD53-AD66C27BCFD7" encoding="&#x2713;">
    <field widget="text" value="" name="username" display="Username" id="uuid-8A71566A-3C82-11F1-AD53-AD66C27BCFD7" attrs="" key="username"/>
    <field widget="password" name="password" display="Password" attrs="" id="uuid-8A719BA2-3C82-11F1-AD53-AD66C27BCFD7" key="password"/>
    <field key="submit" attrs="" id="uuid-8A71E6A2-3C82-11F1-AD53-AD66C27BCFD7" display="Login" name="submit" value="" widget="submit"/>
  </form>
</response>