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" method="post" encoding="&#x2713;" uri="" uuid="BA624C78-6B74-11F1-A12B-A312F9248A5F">
    <field value="" attrs="" display="Username" widget="text" key="username" id="uuid-BA628044-6B74-11F1-A12B-A312F9248A5F" name="username"/>
    <field display="Password" attrs="" widget="password" id="uuid-BA62C838-6B74-11F1-A12B-A312F9248A5F" key="password" name="password"/>
    <field widget="submit" attrs="" display="Login" value="" name="submit" id="uuid-BA6317AC-6B74-11F1-A12B-A312F9248A5F" key="submit"/>
  </form>
</response>