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" uri="" encoding="&#x2713;" key="login" uuid="C6E5A088-750E-11F0-9FED-33A9ED0FA296">
    <field display="Username" attrs="" name="username" widget="text" value="" id="uuid-C6E5D51C-750E-11F0-9FED-33A9ED0FA296" key="username"/>
    <field attrs="" name="password" display="Password" widget="password" key="password" id="uuid-C6E61EF0-750E-11F0-9FED-33A9ED0FA296"/>
    <field display="Login" attrs="" name="submit" value="" widget="submit" id="uuid-C6E66658-750E-11F0-9FED-33A9ED0FA296" key="submit"/>
  </form>
</response>