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" encoding="&#x2713;" uuid="9D29CDBA-D092-11F1-A07B-ACB08D6E13F8" uri="" method="post">
    <field widget="text" attrs="" id="uuid-9D2A01C2-D092-11F1-A07B-ACB08D6E13F8" display="Username" key="username" value="" name="username" extra=""/>
    <field widget="password" key="password" attrs="" display="Password" extra="" id="uuid-9D2A4A24-D092-11F1-A07B-ACB08D6E13F8" name="password"/>
    <field key="submit" value="" name="submit" extra="" widget="submit" attrs="" id="uuid-9D2A9100-D092-11F1-A07B-ACB08D6E13F8" display="Login"/>
  </form>
</response>