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" uri="" key="login" uuid="5706A4C8-8A26-11F1-A18B-765E400CC38E" encoding="&#x2713;">
    <field attrs="" key="username" value="" name="username" id="uuid-5706DA88-8A26-11F1-A18B-765E400CC38E" widget="text" display="Username"/>
    <field widget="password" display="Password" id="uuid-570722FE-8A26-11F1-A18B-765E400CC38E" name="password" key="password" attrs=""/>
    <field id="uuid-57076DB8-8A26-11F1-A18B-765E400CC38E" name="submit" value="" display="Login" widget="submit" key="submit" attrs=""/>
  </form>
</response>