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" uri="" uuid="0F818CA0-903C-11F1-9299-8B4B400CC38E" encoding="&#x2713;">
    <field display="Username" widget="text" id="uuid-0F81C1A2-903C-11F1-9299-8B4B400CC38E" key="username" value="" attrs="" name="username"/>
    <field key="password" name="password" attrs="" display="Password" widget="password" id="uuid-0F820B08-903C-11F1-9299-8B4B400CC38E"/>
    <field attrs="" name="submit" value="" key="submit" id="uuid-0F8254FA-903C-11F1-9299-8B4B400CC38E" widget="submit" display="Login"/>
  </form>
</response>