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="8C1A4F8A-C990-11F1-8050-281F0C50D6CE" uri="" key="login" method="post" encoding="&#x2713;">
    <field widget="text" value="" key="username" display="Username" attrs="" id="uuid-8C1A8400-C990-11F1-8050-281F0C50D6CE" name="username"/>
    <field widget="password" attrs="" display="Password" key="password" id="uuid-8C1ACDB6-C990-11F1-8050-281F0C50D6CE" name="password"/>
    <field name="submit" id="uuid-8C1B19D8-C990-11F1-8050-281F0C50D6CE" key="submit" display="Login" attrs="" value="" widget="submit"/>
  </form>
</response>