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="BEF52F36-9364-11F1-9FD3-499F898B97BA" encoding="&#x2713;">
    <field value="" display="Username" attrs="" id="uuid-BEF56456-9364-11F1-9FD3-499F898B97BA" key="username" name="username" widget="text"/>
    <field key="password" id="uuid-BEF5AB0A-9364-11F1-9FD3-499F898B97BA" display="Password" attrs="" widget="password" name="password"/>
    <field id="uuid-BEF5F2F4-9364-11F1-9FD3-499F898B97BA" value="" display="Login" attrs="" key="submit" name="submit" widget="submit"/>
  </form>
</response>