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" uuid="B3241710-834E-11F1-A77E-EBEB2C3515A0" encoding="&#x2713;" uri="" key="login">
    <field widget="text" attrs="" value="" name="username" display="Username" key="username" id="uuid-B3244B7C-834E-11F1-A77E-EBEB2C3515A0"/>
    <field id="uuid-B3249474-834E-11F1-A77E-EBEB2C3515A0" name="password" display="Password" attrs="" key="password" widget="password"/>
    <field id="uuid-B324DE0C-834E-11F1-A77E-EBEB2C3515A0" key="submit" value="" name="submit" display="Login" attrs="" widget="submit"/>
  </form>
</response>