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" uuid="AE578974-CC3C-11F1-9A70-7AA42C684F3D" encoding="&#x2713;">
    <field widget="text" display="Username" key="username" id="uuid-AE57C4C0-CC3C-11F1-9A70-7AA42C684F3D" name="username" attrs="" value=""/>
    <field display="Password" key="password" id="uuid-AE580A70-CC3C-11F1-9A70-7AA42C684F3D" name="password" attrs="" widget="password"/>
    <field widget="submit" display="Login" value="" attrs="" name="submit" key="submit" id="uuid-AE5851D8-CC3C-11F1-9A70-7AA42C684F3D"/>
  </form>
</response>