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;" method="post" uuid="38C6CADA-D137-11F1-87B1-BEFBB3F3B997">
    <field name="username" extra="" widget="text" value="" id="uuid-38C6F9C4-D137-11F1-87B1-BEFBB3F3B997" key="username" attrs="" display="Username"/>
    <field id="uuid-38C74280-D137-11F1-87B1-BEFBB3F3B997" key="password" attrs="" display="Password" name="password" widget="password" extra=""/>
    <field extra="" name="submit" widget="submit" value="" display="Login" attrs="" key="submit" id="uuid-38C78E34-D137-11F1-87B1-BEFBB3F3B997"/>
  </form>
</response>