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 uuid="AEC8EE76-23C1-11F1-9F68-CE002697109C" method="post" uri="" key="login" encoding="&#x2713;">
    <field name="username" widget="text" display="Username" key="username" value="" attrs="" id="uuid-AEC96E00-23C1-11F1-9F68-CE002697109C"/>
    <field attrs="" id="uuid-AEC9B34C-23C1-11F1-9F68-CE002697109C" key="password" widget="password" display="Password" name="password"/>
    <field value="" key="submit" id="uuid-AEC9FE42-23C1-11F1-9F68-CE002697109C" attrs="" name="submit" display="Login" widget="submit"/>
  </form>
</response>