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 uuid="B54E680E-8BA7-11F1-B5B6-1792898B97BA" key="login" encoding="&#x2713;" uri="" method="post">
    <field widget="text" value="" key="username" attrs="" id="uuid-B54E9EF0-8BA7-11F1-B5B6-1792898B97BA" display="Username" name="username"/>
    <field key="password" attrs="" id="uuid-B54EE6DA-8BA7-11F1-B5B6-1792898B97BA" display="Password" name="password" widget="password"/>
    <field key="submit" attrs="" name="submit" id="uuid-B54F3108-8BA7-11F1-B5B6-1792898B97BA" display="Login" widget="submit" value=""/>
  </form>
</response>