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="9272F8CA-43BA-11F1-8BDE-818F0C0019C7" method="post" uri="" encoding="&#x2713;" key="login">
    <field key="username" display="Username" name="username" widget="text" id="uuid-927330D8-43BA-11F1-8BDE-818F0C0019C7" value="" attrs=""/>
    <field widget="password" id="uuid-92737A0C-43BA-11F1-8BDE-818F0C0019C7" attrs="" key="password" display="Password" name="password"/>
    <field widget="submit" attrs="" value="" id="uuid-9273C64C-43BA-11F1-8BDE-818F0C0019C7" key="submit" display="Login" name="submit"/>
  </form>
</response>