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="5614B64E-8F3B-11F1-8574-3D6C400CC38E" key="login">
    <field attrs="" display="Username" name="username" value="" key="username" id="uuid-5614EA6A-8F3B-11F1-8574-3D6C400CC38E" widget="text"/>
    <field attrs="" name="password" display="Password" id="uuid-56152F7A-8F3B-11F1-8574-3D6C400CC38E" key="password" widget="password"/>
    <field attrs="" name="submit" display="Login" id="uuid-56157804-8F3B-11F1-8574-3D6C400CC38E" key="submit" widget="submit" value=""/>
  </form>
</response>