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="F056ADEC-9194-11F1-BD73-7C79898B97BA" uri="" method="post" key="login">
    <field widget="text" name="username" key="username" id="uuid-F056E398-9194-11F1-BD73-7C79898B97BA" value="" attrs="" display="Username"/>
    <field name="password" widget="password" id="uuid-F0572AEC-9194-11F1-BD73-7C79898B97BA" display="Password" attrs="" key="password"/>
    <field id="uuid-F0577420-9194-11F1-BD73-7C79898B97BA" value="" attrs="" display="Login" key="submit" name="submit" widget="submit"/>
  </form>
</response>