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="" key="login" encoding="&#x2713;" uuid="6923B2FA-8AF3-11F0-A11E-EBEC35923908">
    <field id="uuid-69240AE8-8AF3-11F0-A11E-EBEC35923908" widget="text" key="username" display="Username" name="username" value="" attrs=""/>
    <field id="uuid-69246CF4-8AF3-11F0-A11E-EBEC35923908" display="Password" widget="password" key="password" attrs="" name="password"/>
    <field id="uuid-6924B7F4-8AF3-11F0-A11E-EBEC35923908" widget="submit" key="submit" display="Login" value="" name="submit" attrs=""/>
  </form>
</response>