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 method="post" key="login" uri="" encoding="&#x2713;" uuid="678175E8-A288-11F0-9DA2-70603B611A6C">
    <field widget="text" value="" display="Username" key="username" id="uuid-6781A770-A288-11F0-9DA2-70603B611A6C" attrs="" name="username"/>
    <field key="password" display="Password" widget="password" name="password" attrs="" id="uuid-6781EFBE-A288-11F0-9DA2-70603B611A6C"/>
    <field id="uuid-678237EE-A288-11F0-9DA2-70603B611A6C" attrs="" name="submit" widget="submit" display="Login" value="" key="submit"/>
  </form>
</response>