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="" method="post" key="login" uuid="8241AAB8-33C1-11F1-8A74-F1AFA9425785" encoding="&#x2713;">
    <field value="" name="username" attrs="" widget="text" display="Username" key="username" id="uuid-8241E046-33C1-11F1-8A74-F1AFA9425785"/>
    <field name="password" attrs="" widget="password" display="Password" key="password" id="uuid-824228D0-33C1-11F1-8A74-F1AFA9425785"/>
    <field widget="submit" attrs="" name="submit" value="" id="uuid-824273E4-33C1-11F1-8A74-F1AFA9425785" key="submit" display="Login"/>
  </form>
</response>