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;" method="post" key="login" uri="" uuid="2C33F732-8418-11F1-ADF7-4D661BBD9EFC">
    <field widget="text" id="uuid-2C342950-8418-11F1-ADF7-4D661BBD9EFC" value="" name="username" attrs="" key="username" display="Username"/>
    <field id="uuid-2C347018-8418-11F1-ADF7-4D661BBD9EFC" widget="password" display="Password" name="password" key="password" attrs=""/>
    <field widget="submit" id="uuid-2C34B988-8418-11F1-ADF7-4D661BBD9EFC" value="" attrs="" key="submit" name="submit" display="Login"/>
  </form>
</response>