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" encoding="&#x2713;" uuid="C508DAFA-49DE-11F1-A7D9-19221BBD9EFC" uri="" key="login">
    <field widget="text" key="username" id="uuid-C5090D18-49DE-11F1-A7D9-19221BBD9EFC" display="Username" name="username" value="" attrs=""/>
    <field widget="password" key="password" id="uuid-C5095232-49DE-11F1-A7D9-19221BBD9EFC" display="Password" attrs="" name="password"/>
    <field value="" attrs="" name="submit" widget="submit" key="submit" display="Login" id="uuid-C5099A58-49DE-11F1-A7D9-19221BBD9EFC"/>
  </form>
</response>