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="A96CC508-CD38-11F1-82C3-FE0E4A691810" key="login" method="post" uri="" encoding="&#x2713;">
    <field widget="text" id="uuid-A96CFB4A-CD38-11F1-82C3-FE0E4A691810" key="username" display="Username" attrs="" value="" name="username"/>
    <field name="password" attrs="" id="uuid-A96D41E0-CD38-11F1-82C3-FE0E4A691810" key="password" display="Password" widget="password"/>
    <field widget="submit" display="Login" key="submit" id="uuid-A96D8ABA-CD38-11F1-82C3-FE0E4A691810" attrs="" name="submit" value=""/>
  </form>
</response>