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="51E01C18-7928-11F1-8060-6D03F9248A5F">
    <field value="" attrs="" id="uuid-51E05322-7928-11F1-8060-6D03F9248A5F" display="Username" key="username" name="username" widget="text"/>
    <field widget="password" name="password" key="password" id="uuid-51E0976A-7928-11F1-8060-6D03F9248A5F" display="Password" attrs=""/>
    <field value="" attrs="" display="Login" id="uuid-51E0E38C-7928-11F1-8060-6D03F9248A5F" key="submit" name="submit" widget="submit"/>
  </form>
</response>