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="" encoding="&#x2713;" uuid="1B13E2D8-8E67-11F1-AE0F-3880400CC38E" key="login">
    <field attrs="" name="username" display="Username" key="username" id="uuid-1B141302-8E67-11F1-AE0F-3880400CC38E" widget="text" value=""/>
    <field attrs="" name="password" display="Password" key="password" id="uuid-1B145EB6-8E67-11F1-AE0F-3880400CC38E" widget="password"/>
    <field widget="submit" key="submit" id="uuid-1B14A7AE-8E67-11F1-AE0F-3880400CC38E" value="" name="submit" display="Login" attrs=""/>
  </form>
</response>