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="98C34474-6AB5-11F1-A819-25CDF8248A5F" encoding="&#x2713;" method="post" key="login">
    <field key="username" id="uuid-98C37AD4-6AB5-11F1-A819-25CDF8248A5F" name="username" value="" attrs="" display="Username" widget="text"/>
    <field key="password" id="uuid-98C3C20A-6AB5-11F1-A819-25CDF8248A5F" name="password" attrs="" display="Password" widget="password"/>
    <field key="submit" id="uuid-98C40E0E-6AB5-11F1-A819-25CDF8248A5F" name="submit" value="" attrs="" display="Login" widget="submit"/>
  </form>
</response>