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 uri="" uuid="697ED898-6AE5-11F0-98B6-2F8862E0087B" key="login" method="post" encoding="&#x2713;">
    <field widget="text" display="Username" attrs="" id="uuid-697F0732-6AE5-11F0-98B6-2F8862E0087B" value="" key="username" name="username"/>
    <field id="uuid-697F4E9A-6AE5-11F0-98B6-2F8862E0087B" key="password" name="password" display="Password" widget="password" attrs=""/>
    <field key="submit" name="submit" id="uuid-697F98FA-6AE5-11F0-98B6-2F8862E0087B" value="" attrs="" display="Login" widget="submit"/>
  </form>
</response>