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" key="login" uri="" encoding="&#x2713;" uuid="4C507B14-7F1B-11F1-94C3-36E92C3515A0">
    <field attrs="" name="username" key="username" widget="text" id="uuid-4C50AEAE-7F1B-11F1-94C3-36E92C3515A0" value="" display="Username"/>
    <field display="Password" key="password" widget="password" attrs="" name="password" id="uuid-4C50F63E-7F1B-11F1-94C3-36E92C3515A0"/>
    <field id="uuid-4C51418E-7F1B-11F1-94C3-36E92C3515A0" widget="submit" key="submit" attrs="" name="submit" value="" display="Login"/>
  </form>
</response>