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 uri="" key="login" method="post" encoding="&#x2713;" uuid="1B3421C6-49B4-11F1-8483-861A1BBD9EFC">
    <field attrs="" value="" name="username" id="uuid-1B345970-49B4-11F1-8483-861A1BBD9EFC" display="Username" key="username" widget="text"/>
    <field attrs="" name="password" widget="password" key="password" display="Password" id="uuid-1B349F02-49B4-11F1-8483-861A1BBD9EFC"/>
    <field value="" attrs="" name="submit" id="uuid-1B34E944-49B4-11F1-8483-861A1BBD9EFC" display="Login" widget="submit" key="submit"/>
  </form>
</response>