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;" uri="" key="login" uuid="C1219916-6F88-11F1-B1A5-19868F49F76F" method="post">
    <field value="" attrs="" key="username" id="uuid-C121CF58-6F88-11F1-B1A5-19868F49F76F" display="Username" name="username" widget="text"/>
    <field attrs="" key="password" id="uuid-C1221490-6F88-11F1-B1A5-19868F49F76F" widget="password" name="password" display="Password"/>
    <field value="" key="submit" attrs="" id="uuid-C1225B6C-6F88-11F1-B1A5-19868F49F76F" name="submit" display="Login" widget="submit"/>
  </form>
</response>