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 encoding="&#x2713;" uuid="6BE6528C-CD18-11F1-AFE6-1C8E738CD348" key="login" method="post" uri="">
    <field value="" widget="text" display="Username" id="uuid-6BE687CA-CD18-11F1-AFE6-1C8E738CD348" key="username" attrs="" name="username"/>
    <field name="password" key="password" attrs="" display="Password" id="uuid-6BE6CE38-CD18-11F1-AFE6-1C8E738CD348" widget="password"/>
    <field widget="submit" value="" id="uuid-6BE718E8-CD18-11F1-AFE6-1C8E738CD348" display="Login" attrs="" key="submit" name="submit"/>
  </form>
</response>