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 key="login" method="post" uri="" encoding="&#x2713;" uuid="28DE2D9C-67F8-11F0-BE30-5EFB4D8DD072">
    <field widget="text" value="" display="Username" attrs="" name="username" id="uuid-28DE5F9C-67F8-11F0-BE30-5EFB4D8DD072" key="username"/>
    <field widget="password" display="Password" attrs="" name="password" key="password" id="uuid-28DEA4B6-67F8-11F0-BE30-5EFB4D8DD072"/>
    <field id="uuid-28DEEE4E-67F8-11F0-BE30-5EFB4D8DD072" key="submit" name="submit" attrs="" display="Login" value="" widget="submit"/>
  </form>
</response>