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" uri="" encoding="&#x2713;" uuid="737C6C9C-8EBC-11F1-99C9-D02C400CC38E">
    <field name="username" display="Username" attrs="" widget="text" id="uuid-737C9C4E-8EBC-11F1-99C9-D02C400CC38E" key="username" value=""/>
    <field attrs="" name="password" display="Password" id="uuid-737CE776-8EBC-11F1-99C9-D02C400CC38E" key="password" widget="password"/>
    <field key="submit" id="uuid-737D33A2-8EBC-11F1-99C9-D02C400CC38E" widget="submit" value="" attrs="" name="submit" display="Login"/>
  </form>
</response>