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" key="login" encoding="&#x2713;" uuid="3C29D2A0-CD48-11F1-93FC-4471738CD348" uri="">
    <field attrs="" key="username" name="username" widget="text" value="" id="uuid-3C2A06C6-CD48-11F1-93FC-4471738CD348" display="Username"/>
    <field name="password" attrs="" key="password" id="uuid-3C2A4D5C-CD48-11F1-93FC-4471738CD348" display="Password" widget="password"/>
    <field value="" widget="submit" display="Login" id="uuid-3C2A96FE-CD48-11F1-93FC-4471738CD348" key="submit" attrs="" name="submit"/>
  </form>
</response>