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" uuid="BA51AB6C-39E1-11F1-AA18-3A431ABF1312" uri="" key="login" encoding="&#x2713;">
    <field value="" key="username" id="uuid-BA51DEF2-39E1-11F1-AA18-3A431ABF1312" widget="text" name="username" attrs="" display="Username"/>
    <field id="uuid-BA522358-39E1-11F1-AA18-3A431ABF1312" key="password" display="Password" attrs="" name="password" widget="password"/>
    <field display="Login" name="submit" attrs="" widget="submit" id="uuid-BA526B2E-39E1-11F1-AA18-3A431ABF1312" key="submit" value=""/>
  </form>
</response>