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" uuid="45F4B590-7954-11F1-BB7B-34AA8F49F76F" key="login" uri="" encoding="&#x2713;">
    <field widget="text" value="" attrs="" name="username" key="username" id="uuid-45F4F0FA-7954-11F1-BB7B-34AA8F49F76F" display="Username"/>
    <field attrs="" widget="password" id="uuid-45F53BA0-7954-11F1-BB7B-34AA8F49F76F" display="Password" name="password" key="password"/>
    <field key="submit" name="submit" id="uuid-45F58AC4-7954-11F1-BB7B-34AA8F49F76F" display="Login" widget="submit" attrs="" value=""/>
  </form>
</response>