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 method="post" key="login" encoding="&#x2713;" uuid="9B81CD7C-3237-11F1-865D-CCA0A9425785" uri="">
    <field widget="text" id="uuid-9B8206FC-3237-11F1-865D-CCA0A9425785" name="username" key="username" attrs="" display="Username" value=""/>
    <field display="Password" attrs="" widget="password" id="uuid-9B824C0C-3237-11F1-865D-CCA0A9425785" key="password" name="password"/>
    <field attrs="" value="" display="Login" widget="submit" id="uuid-9B8294F0-3237-11F1-865D-CCA0A9425785" name="submit" key="submit"/>
  </form>
</response>