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="" encoding="&#x2713;" method="post" key="login" uuid="613BECBE-6B8B-11F1-B84D-C3721BBD9EFC">
    <field widget="text" name="username" key="username" id="uuid-613C2288-6B8B-11F1-B84D-C3721BBD9EFC" display="Username" value="" attrs=""/>
    <field name="password" key="password" id="uuid-613C690A-6B8B-11F1-B84D-C3721BBD9EFC" display="Password" attrs="" widget="password"/>
    <field id="uuid-613CB6B2-6B8B-11F1-B84D-C3721BBD9EFC" key="submit" name="submit" attrs="" value="" display="Login" widget="submit"/>
  </form>
</response>