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 encoding="&#x2713;" method="post" uri="" key="login" uuid="7086CC50-326C-11F1-B496-5F711ABF1312">
    <field name="username" value="" display="Username" attrs="" widget="text" id="uuid-7086FF9A-326C-11F1-B496-5F711ABF1312" key="username"/>
    <field id="uuid-708749BE-326C-11F1-B496-5F711ABF1312" attrs="" key="password" widget="password" display="Password" name="password"/>
    <field id="uuid-708793E2-326C-11F1-B496-5F711ABF1312" widget="submit" attrs="" key="submit" display="Login" name="submit" value=""/>
  </form>
</response>