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 uri="" key="login" encoding="&#x2713;" uuid="35BDBE18-C9D3-11F1-BB8A-A1352C684F3D" method="post">
    <field widget="text" id="uuid-35BDF8B0-C9D3-11F1-BB8A-A1352C684F3D" name="username" key="username" value="" attrs="" display="Username"/>
    <field attrs="" key="password" name="password" id="uuid-35BE4234-C9D3-11F1-BB8A-A1352C684F3D" display="Password" widget="password"/>
    <field display="Login" value="" attrs="" id="uuid-35BE8BD6-C9D3-11F1-BB8A-A1352C684F3D" key="submit" name="submit" widget="submit"/>
  </form>
</response>