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="068B403E-963F-11F0-80B6-F7DF54FD9ABD" uri="" key="login" encoding="&#x2713;" method="post">
    <field value="" widget="text" key="username" id="uuid-068B75B8-963F-11F0-80B6-F7DF54FD9ABD" name="username" display="Username" attrs=""/>
    <field widget="password" id="uuid-068BBD2A-963F-11F0-80B6-F7DF54FD9ABD" key="password" display="Password" name="password" attrs=""/>
    <field display="Login" name="submit" attrs="" value="" widget="submit" id="uuid-068C0C6C-963F-11F0-80B6-F7DF54FD9ABD" key="submit"/>
  </form>
</response>