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" encoding="&#x2713;" uuid="37416AEA-8DC0-11F1-8994-5C70898B97BA">
    <field value="" display="Username" id="uuid-3741A0FA-8DC0-11F1-8994-5C70898B97BA" attrs="" name="username" key="username" widget="text"/>
    <field key="password" widget="password" id="uuid-3741E8C6-8DC0-11F1-8994-5C70898B97BA" display="Password" name="password" attrs=""/>
    <field value="" id="uuid-374230BA-8DC0-11F1-8994-5C70898B97BA" display="Login" attrs="" name="submit" key="submit" widget="submit"/>
  </form>
</response>