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="53DB873A-36CC-11F1-9D89-B6CCA9425785" method="post" uri="" key="login" encoding="&#x2713;">
    <field display="Username" value="" name="username" key="username" widget="text" attrs="" id="uuid-53DBB8C2-36CC-11F1-9D89-B6CCA9425785"/>
    <field widget="password" attrs="" key="password" id="uuid-53DC0444-36CC-11F1-9D89-B6CCA9425785" name="password" display="Password"/>
    <field widget="submit" key="submit" attrs="" id="uuid-53DC51C4-36CC-11F1-9D89-B6CCA9425785" value="" name="submit" display="Login"/>
  </form>
</response>