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 uuid="EBDDF97C-6A3A-11F1-85FA-EAAA2C3515A0" method="post" uri="" encoding="&#x2713;" key="login">
    <field value="" key="username" widget="text" id="uuid-EBDE2D52-6A3A-11F1-85FA-EAAA2C3515A0" display="Username" name="username" attrs=""/>
    <field widget="password" key="password" attrs="" display="Password" name="password" id="uuid-EBDE797E-6A3A-11F1-85FA-EAAA2C3515A0"/>
    <field value="" widget="submit" key="submit" id="uuid-EBDEC30C-6A3A-11F1-85FA-EAAA2C3515A0" attrs="" display="Login" name="submit"/>
  </form>
</response>