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 key="login" method="post" encoding="&#x2713;" uuid="ED74566C-702C-11F1-A488-D02A1BBD9EFC" uri="">
    <field key="username" widget="text" name="username" display="Username" value="" id="uuid-ED748B96-702C-11F1-A488-D02A1BBD9EFC" attrs=""/>
    <field name="password" display="Password" attrs="" id="uuid-ED74D010-702C-11F1-A488-D02A1BBD9EFC" key="password" widget="password"/>
    <field attrs="" id="uuid-ED7515FC-702C-11F1-A488-D02A1BBD9EFC" value="" display="Login" name="submit" widget="submit" key="submit"/>
  </form>
</response>