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="" encoding="&#x2713;" uuid="378FEB92-2A39-11F1-B9A6-CD7A1ABF1312" key="login">
    <field key="username" name="username" widget="text" value="" display="Username" attrs="" id="uuid-3790187E-2A39-11F1-B9A6-CD7A1ABF1312"/>
    <field key="password" name="password" widget="password" display="Password" attrs="" id="uuid-37905FAA-2A39-11F1-B9A6-CD7A1ABF1312"/>
    <field widget="submit" name="submit" key="submit" id="uuid-3790AA28-2A39-11F1-B9A6-CD7A1ABF1312" attrs="" display="Login" value=""/>
  </form>
</response>