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 key="login" method="post" encoding="&#x2713;" uuid="38B72CA8-6A29-11F1-B0EC-4507F9248A5F" uri="">
    <field value="" display="Username" attrs="" widget="text" key="username" id="uuid-38B7615A-6A29-11F1-B0EC-4507F9248A5F" name="username"/>
    <field name="password" key="password" id="uuid-38B7A926-6A29-11F1-B0EC-4507F9248A5F" widget="password" display="Password" attrs=""/>
    <field name="submit" key="submit" id="uuid-38B7F354-6A29-11F1-B0EC-4507F9248A5F" widget="submit" value="" attrs="" display="Login"/>
  </form>
</response>