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" uuid="F924F31E-34A3-11F1-845D-99870C0019C7" uri="" encoding="&#x2713;" key="login">
    <field name="username" key="username" value="" attrs="" display="Username" widget="text" id="uuid-F9252884-34A3-11F1-845D-99870C0019C7"/>
    <field name="password" key="password" attrs="" display="Password" id="uuid-F92572C6-34A3-11F1-845D-99870C0019C7" widget="password"/>
    <field value="" key="submit" name="submit" id="uuid-F925BE52-34A3-11F1-845D-99870C0019C7" widget="submit" attrs="" display="Login"/>
  </form>
</response>