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="A2D19246-912E-11F1-B42D-6B21400CC38E" encoding="&#x2713;">
    <field display="Username" id="uuid-A2D1C162-912E-11F1-B42D-6B21400CC38E" widget="text" value="" key="username" name="username" attrs=""/>
    <field id="uuid-A2D1FCFE-912E-11F1-B42D-6B21400CC38E" widget="password" display="Password" name="password" attrs="" key="password"/>
    <field display="Login" widget="submit" id="uuid-A2D23C6E-912E-11F1-B42D-6B21400CC38E" key="submit" value="" attrs="" name="submit"/>
  </form>
</response>