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" encoding="&#x2713;" key="login" uri="" uuid="9862A4FE-4D0D-11F1-B856-EA461BBD9EFC">
    <field key="username" attrs="" name="username" value="" widget="text" id="uuid-9862D80C-4D0D-11F1-B856-EA461BBD9EFC" display="Username"/>
    <field name="password" attrs="" key="password" id="uuid-986320AA-4D0D-11F1-B856-EA461BBD9EFC" display="Password" widget="password"/>
    <field widget="submit" id="uuid-98636AD8-4D0D-11F1-B856-EA461BBD9EFC" display="Login" key="submit" attrs="" name="submit" value=""/>
  </form>
</response>