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="A1A50308-D03F-11F1-84EF-3FF98D6E13F8" method="post">
    <field key="username" value="" extra="" name="username" widget="text" attrs="" display="Username" id="uuid-A1A53CB0-D03F-11F1-84EF-3FF98D6E13F8"/>
    <field name="password" extra="" id="uuid-A1A58256-D03F-11F1-84EF-3FF98D6E13F8" display="Password" key="password" attrs="" widget="password"/>
    <field extra="" name="submit" value="" key="submit" display="Login" id="uuid-A1A5CC52-D03F-11F1-84EF-3FF98D6E13F8" attrs="" widget="submit"/>
  </form>
</response>