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" uri="" key="login" uuid="79F8464A-7607-11F1-BC04-E3F925D43659" encoding="&#x2713;">
    <field attrs="" name="username" value="" widget="text" id="uuid-79F869EA-7607-11F1-BC04-E3F925D43659" key="username" display="Username"/>
    <field id="uuid-79F88C18-7607-11F1-BC04-E3F925D43659" widget="password" display="Password" key="password" attrs="" name="password"/>
    <field attrs="" value="" name="submit" id="uuid-79F8B6C0-7607-11F1-BC04-E3F925D43659" widget="submit" display="Login" key="submit"/>
  </form>
</response>