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 key="login" uri="" uuid="7C0E913C-CF94-11F1-9810-9FEB0B50D6CE" method="post" encoding="&#x2713;">
    <field widget="text" extra="" attrs="" value="" name="username" display="Username" id="uuid-7C0EC3D2-CF94-11F1-9810-9FEB0B50D6CE" key="username"/>
    <field key="password" name="password" display="Password" id="uuid-7C0F0856-CF94-11F1-9810-9FEB0B50D6CE" widget="password" extra="" attrs=""/>
    <field key="submit" id="uuid-7C0F5248-CF94-11F1-9810-9FEB0B50D6CE" display="Login" name="submit" value="" extra="" attrs="" widget="submit"/>
  </form>
</response>