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="A080F626-A502-11F0-A2D3-A51A36923908" uri="" method="post" key="login">
    <field value="" widget="text" key="username" id="uuid-A0812D30-A502-11F0-A2D3-A51A36923908" display="Username" attrs="" name="username"/>
    <field widget="password" key="password" id="uuid-A0817330-A502-11F0-A2D3-A51A36923908" display="Password" attrs="" name="password"/>
    <field name="submit" attrs="" display="Login" id="uuid-A081BF0C-A502-11F0-A2D3-A51A36923908" key="submit" widget="submit" value=""/>
  </form>
</response>