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 method="post" uuid="319A94D6-46AD-11F1-8FF4-8416F9248A5F" encoding="&#x2713;" uri="" key="login">
    <field value="" key="username" widget="text" name="username" attrs="" id="uuid-319ACA78-46AD-11F1-8FF4-8416F9248A5F" display="Username"/>
    <field widget="password" key="password" display="Password" id="uuid-319B1226-46AD-11F1-8FF4-8416F9248A5F" name="password" attrs=""/>
    <field attrs="" id="uuid-319B5B46-46AD-11F1-8FF4-8416F9248A5F" name="submit" display="Login" value="" key="submit" widget="submit"/>
  </form>
</response>