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="2AC3E5C6-97DB-11F0-8E41-184736923908" encoding="&#x2713;" uri="" method="post" key="login">
    <field value="" name="username" widget="text" key="username" id="uuid-2AC41C94-97DB-11F0-8E41-184736923908" attrs="" display="Username"/>
    <field name="password" widget="password" key="password" id="uuid-2AC464F6-97DB-11F0-8E41-184736923908" attrs="" display="Password"/>
    <field name="submit" widget="submit" value="" attrs="" display="Login" key="submit" id="uuid-2AC4AEC0-97DB-11F0-8E41-184736923908"/>
  </form>
</response>