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="CCCCC93E-3A90-11F1-A074-6EB8A9425785" key="login">
    <field value="" name="username" display="Username" attrs="" id="uuid-CCCCF756-3A90-11F1-A074-6EB8A9425785" key="username" widget="text"/>
    <field display="Password" attrs="" name="password" id="uuid-CCCD384C-3A90-11F1-A074-6EB8A9425785" widget="password" key="password"/>
    <field id="uuid-CCCD7F46-3A90-11F1-A074-6EB8A9425785" key="submit" widget="submit" name="submit" value="" attrs="" display="Login"/>
  </form>
</response>