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="DF00FD66-9AA7-11F0-969A-0EE454FD9ABD">
    <field key="username" widget="text" id="uuid-DF01333A-9AA7-11F0-969A-0EE454FD9ABD" attrs="" name="username" display="Username" value=""/>
    <field key="password" widget="password" id="uuid-DF017836-9AA7-11F0-969A-0EE454FD9ABD" display="Password" attrs="" name="password"/>
    <field key="submit" widget="submit" id="uuid-DF01C098-9AA7-11F0-969A-0EE454FD9ABD" name="submit" display="Login" attrs="" value=""/>
  </form>
</response>