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="5E8C001C-24B4-11F1-ADDF-9B721ABF1312" method="post">
    <field name="username" value="" id="uuid-5E8C3564-24B4-11F1-ADDF-9B721ABF1312" key="username" attrs="" widget="text" display="Username"/>
    <field widget="password" attrs="" name="password" key="password" id="uuid-5E8C7A6A-24B4-11F1-ADDF-9B721ABF1312" display="Password"/>
    <field attrs="" widget="submit" key="submit" id="uuid-5E8CC498-24B4-11F1-ADDF-9B721ABF1312" value="" name="submit" display="Login"/>
  </form>
</response>