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;" uuid="7A40E39A-25EA-11F1-8823-D56E1ABF1312" method="post" uri="" key="login">
    <field name="username" key="username" id="uuid-7A411522-25EA-11F1-8823-D56E1ABF1312" value="" attrs="" widget="text" display="Username"/>
    <field key="password" id="uuid-7A415E7E-25EA-11F1-8823-D56E1ABF1312" name="password" widget="password" attrs="" display="Password"/>
    <field display="Login" attrs="" widget="submit" name="submit" key="submit" value="" id="uuid-7A41A83E-25EA-11F1-8823-D56E1ABF1312"/>
  </form>
</response>