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="" encoding="&#x2713;" key="login" uuid="0B8F7AFC-6FF9-11F1-BD09-1EE22C3515A0" method="post">
    <field key="username" value="" widget="text" display="Username" attrs="" id="uuid-0B8FAB12-6FF9-11F1-BD09-1EE22C3515A0" name="username"/>
    <field key="password" display="Password" attrs="" name="password" id="uuid-0B8FEAAA-6FF9-11F1-BD09-1EE22C3515A0" widget="password"/>
    <field key="submit" display="Login" attrs="" id="uuid-0B902BA0-6FF9-11F1-BD09-1EE22C3515A0" name="submit" widget="submit" value=""/>
  </form>
</response>