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 uuid="81FA3050-4A57-11F1-8F6A-7C43242F1D8B" method="post" uri="" encoding="&#x2713;" key="login">
    <field attrs="" widget="text" name="username" key="username" id="uuid-81FA6282-4A57-11F1-8F6A-7C43242F1D8B" value="" display="Username"/>
    <field display="Password" id="uuid-81FAA788-4A57-11F1-8F6A-7C43242F1D8B" key="password" name="password" attrs="" widget="password"/>
    <field value="" display="Login" id="uuid-81FAEFB8-4A57-11F1-8F6A-7C43242F1D8B" key="submit" name="submit" attrs="" widget="submit"/>
  </form>
</response>