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 key="login" encoding="&#x2713;" uuid="E53C378A-6BEF-11F1-AD6A-C1E72C3515A0" method="post" uri="">
    <field value="" key="username" widget="text" id="uuid-E53C6DEA-6BEF-11F1-AD6A-C1E72C3515A0" name="username" display="Username" attrs=""/>
    <field widget="password" key="password" attrs="" display="Password" name="password" id="uuid-E53CB78C-6BEF-11F1-AD6A-C1E72C3515A0"/>
    <field value="" key="submit" widget="submit" id="uuid-E53D0A0C-6BEF-11F1-AD6A-C1E72C3515A0" name="submit" display="Login" attrs=""/>
  </form>
</response>