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" encoding="&#x2713;" method="post" uuid="46797836-CC2C-11F1-9DFF-4D1B0C50D6CE" uri="">
    <field attrs="" key="username" display="Username" value="" widget="text" name="username" id="uuid-4679AC16-CC2C-11F1-9DFF-4D1B0C50D6CE"/>
    <field key="password" display="Password" attrs="" widget="password" name="password" id="uuid-4679F662-CC2C-11F1-9DFF-4D1B0C50D6CE"/>
    <field attrs="" key="submit" display="Login" value="" widget="submit" name="submit" id="uuid-467A4324-CC2C-11F1-9DFF-4D1B0C50D6CE"/>
  </form>
</response>