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 uri="" key="login" encoding="&#x2713;" method="post" uuid="A8021530-8F51-11F1-9763-E2267BD1CDC2">
    <field key="username" widget="text" attrs="" name="username" value="" id="uuid-A8024C76-8F51-11F1-9763-E2267BD1CDC2" display="Username"/>
    <field widget="password" attrs="" key="password" display="Password" id="uuid-A8029460-8F51-11F1-9763-E2267BD1CDC2" name="password"/>
    <field name="submit" display="Login" id="uuid-A802E01E-8F51-11F1-9763-E2267BD1CDC2" value="" widget="submit" attrs="" key="submit"/>
  </form>
</response>