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" uuid="E21213A0-224C-11F1-8125-64D6A9425785" encoding="&#x2713;">
    <field name="username" attrs="" widget="text" id="uuid-E212442E-224C-11F1-8125-64D6A9425785" display="Username" value="" key="username"/>
    <field display="Password" key="password" name="password" attrs="" id="uuid-E2128CC2-224C-11F1-8125-64D6A9425785" widget="password"/>
    <field name="submit" attrs="" widget="submit" id="uuid-E212D75E-224C-11F1-8125-64D6A9425785" display="Login" value="" key="submit"/>
  </form>
</response>