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" uuid="622A6626-4171-11F1-B9DE-CCE27F2D798A" method="post" encoding="&#x2713;">
    <field value="" name="username" attrs="" display="Username" widget="text" key="username" id="uuid-622AA0F0-4171-11F1-B9DE-CCE27F2D798A"/>
    <field name="password" display="Password" attrs="" widget="password" key="password" id="uuid-622AEE5C-4171-11F1-B9DE-CCE27F2D798A"/>
    <field key="submit" widget="submit" id="uuid-622B3EF2-4171-11F1-B9DE-CCE27F2D798A" value="" name="submit" attrs="" display="Login"/>
  </form>
</response>