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 uuid="7049AA40-A31A-11F1-86B7-1B88FD48BEF4" method="post" encoding="&#x2713;" key="login" uri="">
    <field value="" attrs="" widget="text" name="username" display="Username" id="uuid-7049DD9E-A31A-11F1-86B7-1B88FD48BEF4" key="username"/>
    <field widget="password" attrs="" id="uuid-704A24B6-A31A-11F1-86B7-1B88FD48BEF4" display="Password" key="password" name="password"/>
    <field widget="submit" attrs="" value="" key="submit" id="uuid-704A710A-A31A-11F1-86B7-1B88FD48BEF4" display="Login" name="submit"/>
  </form>
</response>