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;" uuid="40105514-394C-11F1-AB51-6CB2A9425785" uri="">
    <field widget="text" display="Username" id="uuid-40108610-394C-11F1-AB51-6CB2A9425785" name="username" attrs="" value="" key="username"/>
    <field widget="password" display="Password" id="uuid-4010D2C8-394C-11F1-AB51-6CB2A9425785" attrs="" name="password" key="password"/>
    <field value="" key="submit" name="submit" attrs="" display="Login" id="uuid-40111DE6-394C-11F1-AB51-6CB2A9425785" widget="submit"/>
  </form>
</response>