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="450B8120-8757-11F1-94C9-D230400CC38E" encoding="&#x2713;">
    <field value="" attrs="" id="uuid-450BBCDA-8757-11F1-94C9-D230400CC38E" widget="text" key="username" name="username" display="Username"/>
    <field attrs="" id="uuid-450C0794-8757-11F1-94C9-D230400CC38E" widget="password" key="password" name="password" display="Password"/>
    <field id="uuid-450C580C-8757-11F1-94C9-D230400CC38E" value="" attrs="" name="submit" display="Login" widget="submit" key="submit"/>
  </form>
</response>