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" encoding="&#x2713;" key="login" uri="" uuid="2A8BA79E-3B08-11F1-B2A0-20FF7F2D798A">
    <field value="" id="uuid-2A8BE57E-3B08-11F1-B2A0-20FF7F2D798A" name="username" widget="text" display="Username" attrs="" key="username"/>
    <field id="uuid-2A8C33D0-3B08-11F1-B2A0-20FF7F2D798A" attrs="" key="password" display="Password" name="password" widget="password"/>
    <field name="submit" widget="submit" display="Login" attrs="" key="submit" value="" id="uuid-2A8C8182-3B08-11F1-B2A0-20FF7F2D798A"/>
  </form>
</response>