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="4F26F682-3DB8-11F1-BC91-3E281ABF1312" encoding="&#x2713;" key="login" method="post">
    <field value="" attrs="" key="username" name="username" display="Username" id="uuid-4F272A12-3DB8-11F1-BC91-3E281ABF1312" widget="text"/>
    <field key="password" attrs="" name="password" display="Password" widget="password" id="uuid-4F2771C0-3DB8-11F1-BC91-3E281ABF1312"/>
    <field widget="submit" id="uuid-4F27BD4C-3DB8-11F1-BC91-3E281ABF1312" name="submit" display="Login" key="submit" value="" attrs=""/>
  </form>
</response>