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 method="post" encoding="&#x2713;" uuid="6F65E014-8F50-11F0-896A-07603B611A6C" uri="" key="login">
    <field value="" widget="text" id="uuid-6F66040E-8F50-11F0-896A-07603B611A6C" name="username" display="Username" key="username" attrs=""/>
    <field widget="password" name="password" id="uuid-6F664D2E-8F50-11F0-896A-07603B611A6C" key="password" display="Password" attrs=""/>
    <field widget="submit" value="" name="submit" id="uuid-6F669554-8F50-11F0-896A-07603B611A6C" key="submit" display="Login" attrs=""/>
  </form>
</response>