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="DCF47EB4-CF51-11F1-B8E7-4EE10B50D6CE" method="post" uri="">
    <field name="username" display="Username" value="" attrs="" extra="" widget="text" key="username" id="uuid-DCF4B0C8-CF51-11F1-B8E7-4EE10B50D6CE"/>
    <field id="uuid-DCF4F5EC-CF51-11F1-B8E7-4EE10B50D6CE" widget="password" extra="" attrs="" key="password" display="Password" name="password"/>
    <field attrs="" extra="" widget="submit" display="Login" name="submit" value="" id="uuid-DCF54114-CF51-11F1-B8E7-4EE10B50D6CE" key="submit"/>
  </form>
</response>