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 key="login" uri="" uuid="7A26877C-D00B-11F1-AD88-3AAE0B50D6CE" method="post" encoding="&#x2713;">
    <field name="username" display="Username" value="" extra="" attrs="" widget="text" key="username" id="uuid-7A26BEA4-D00B-11F1-AD88-3AAE0B50D6CE"/>
    <field key="password" display="Password" name="password" id="uuid-7A2704A4-D00B-11F1-AD88-3AAE0B50D6CE" widget="password" extra="" attrs=""/>
    <field value="" display="Login" name="submit" widget="submit" extra="" attrs="" key="submit" id="uuid-7A27558A-D00B-11F1-AD88-3AAE0B50D6CE"/>
  </form>
</response>