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="" key="login" encoding="&#x2713;" uuid="C55F388A-8B77-11F0-A2D4-E12736923908" method="post">
    <field key="username" widget="text" display="Username" value="" name="username" attrs="" id="uuid-C55F677E-8B77-11F0-A2D4-E12736923908"/>
    <field id="uuid-C55FAF7C-8B77-11F0-A2D4-E12736923908" name="password" attrs="" widget="password" display="Password" key="password"/>
    <field name="submit" attrs="" value="" display="Login" widget="submit" key="submit" id="uuid-C55FF842-8B77-11F0-A2D4-E12736923908"/>
  </form>
</response>